Minecraft Stopwatch with Only One Command

summon falling_block ~ ~1 ~ {Block:stone,Time:1,Passengers:[{id:falling_block,Block:redstone_block,Time:1,Passengers:[{id:falling_block,Block:activator_rail,Time:1,Passengers:[{id:commandblock_minecart,Command:"gamerule commandBlockOutput false"},{id:commandblock_minecart,Command:"fill ~-2 ~-3 ~2 ~-8 ~1 ~-2 concrete 4 hollow"},{id:commandblock_minecart,Command:"fill ~-2 ~-2 ~2 ~-8 ~ ~-2 stained_glass 7 0 concrete"},{id:commandblock_minecart,Command:" /give @p spawn_egg 1 65 {display:{Name:\"Start\"},EntityTag:{id:\"bat\"}}"},{id:commandblock_minecart,Command:" /tellraw @a {\"text\":\"\"}"},{id:commandblock_minecart,Command:" /tellraw @a {\"text\":\"\"}"},{id:commandblock_minecart,Command:" /tellraw @a {\"text\":\"\"}"},{id:commandblock_minecart,Command:" /tellraw @a {\"text\":\"\"}"},{id:commandblock_minecart,Command:" /tellraw @a {\"text\":\"\"}"},{id:commandblock_minecart,Command:" /tellraw @a [\"\",{\"text\":\"Check out my \"},{\"text\":\"YT-Channel \",\"color\":\"dark_red\"},{\"text\":\"right -> \",\"color\":\"none\"},{\"text\":\"HERE\",\"color\":\"green\",\"bold\":true,\"underlined\":true,\"clickEvent\":{\"action\":\"open_url\",\"value\":\"https://www.YouTube.com/TheCreativeSimon\"}}]"},{id:commandblock_minecart,Command:" /tellraw @a {\"text\":\"\"}"},{id:commandblock_minecart,Command:" /tellraw @a {\"text\":\"\"}"},{id:commandblock_minecart,Command:" /tellraw @a {\"text\":\"\"}"},{id:commandblock_minecart,Command:" /tellraw @a {\"text\":\"\"}"},{id:commandblock_minecart,Command:" /tellraw @a {\"text\":\"\"}"},{id:commandblock_minecart,Command:"setblock ~-1 ~-2 ~ wall_sign 5 0 {Text1:\"{\\\"text\\\":\\\"============\\\"}\",Text2:\"{\\\"text\\\":\\\"Click to destroy\\\"}\",Text3:\"{\\\"text\\\":\\\"this machine\\\"}\",Text4:\"{\\\"text\\\":\\\"============\\\",\\\"clickEvent\\\":{\\\"action\\\":\\\"run_command\\\",\\\"value\\\":\\\"fill ~-8 ~-1 ~-2 ~-1 ~3 ~2 air\\\"}}\"}"},{id:commandblock_minecart,Command:"setblock ~-1 ~-1 ~ wall_sign 5 0 {Text1:\"{\\\"text\\\":\\\"\\\"}\",Text2:\"{\\\"text\\\":\\\"Stopwatch\\\",\\\"color\\\":\\\"dark_blue\\\",\\\"italic\\\":true}\",Text3:\"{\\\"text\\\":\\\"by TCSimon\\\",\\\"color\\\":\\\"dark_red\\\"}\",Text4:\"{\\\"text\\\":\\\"\\\"}\"}"},{id:commandblock_minecart,Command:"fill ~-7 ~-2 ~-1 ~-3 ~ ~1 chain_command_block 4"},{id:commandblock_minecart,Command:"setblock ~-3 ~ ~ chain_command_block 2"},{id:commandblock_minecart,Command:"fill ~-7 ~ ~ ~-4 ~ ~ chain_command_block 5"},{id:commandblock_minecart,Command:"setblock ~-7 ~ ~1 chain_command_block 2"},{id:commandblock_minecart,Command:"setblock ~-3 ~-1 ~1 chain_command_block 1"},{id:commandblock_minecart,Command:"fill ~-7 ~-1 ~1 ~-4 ~-1 ~1 chain_command_block 5"},{id:commandblock_minecart,Command:"setblock ~-7 ~-1 ~ chain_command_block 3"},{id:commandblock_minecart,Command:"setblock ~-3 ~-1 ~-1 chain_command_block 3"},{id:commandblock_minecart,Command:"fill ~-7 ~-1 ~-1 ~-4 ~-1 ~-1 chain_command_block 5"},{id:commandblock_minecart,Command:"setblock ~-7 ~-2 ~-1 chain_command_block 1"},{id:commandblock_minecart,Command:"setblock ~-3 ~-2 ~ chain_command_block 2"},{id:commandblock_minecart,Command:"fill ~-7 ~-2 ~ ~-4 ~-2 ~ chain_command_block 5"},{id:commandblock_minecart,Command:"setblock ~-7 ~-2 ~1 chain_command_block 2"},{id:commandblock_minecart,Command:"setblock ~-3 ~-2 ~1 repeating_command_block 4"},{id:commandblock_minecart,Command:"blockdata ~-3 ~ ~ {auto:1,Command:\"kill @e[type=bat,name=Stop]\"}"},{id:commandblock_minecart,Command:"blockdata ~-4 ~ ~ {auto:1,Command:\"execute @e[type=bat,name=Stop] ~ ~ ~ give @p spawn_egg 1 65 {display:{Name:\\\"Start\\\"},EntityTag:{id:\\\"bat\\\"}}\"}"},{id:commandblock_minecart,Command:"blockdata ~-5 ~ ~ {auto:1,Command:\"execute @e[type=bat,name=Stop] ~ ~ ~ clear @p spawn_egg 65 1 {display:{Name:Stop}}\"}"},{id:commandblock_minecart,Command:"blockdata ~-6 ~ ~ {auto:1,Command:\"execute @e[type=bat,name=Stop] ~ ~ ~ kill @e[type=armor_stand,tag=hou]\"}"},{id:commandblock_minecart,Command:"blockdata ~-7 ~ ~ {auto:1,Command:\"execute @e[type=bat,name=Stop] ~ ~ ~ scoreboard objectives remove hours\"}"},{id:commandblock_minecart,Command:"blockdata ~-7 ~ ~1 {auto:1,Command:\"execute @e[type=bat,name=Stop] ~ ~ ~ kill @e[type=armor_stand,tag=min]\"}"},{id:commandblock_minecart,Command:"blockdata ~-6 ~ ~1 {auto:1,Command:\"execute @e[type=bat,name=Stop] ~ ~ ~ scoreboard objectives remove minutes\"}"},{id:commandblock_minecart,Command:"blockdata ~-5 ~ ~1 {auto:1,Command:\"execute @e[type=bat,name=Stop] ~ ~ ~ kill @e[type=armor_stand,tag=sec]\"}"},{id:commandblock_minecart,Command:"blockdata ~-4 ~ ~1 {auto:1,Command:\"execute @e[type=bat,name=Stop] ~ ~ ~ scoreboard objectives remove seconds\"}"},{id:commandblock_minecart,Command:"blockdata ~-3 ~ ~1 {auto:1,Command:\"execute @e[type=bat,name=Stop] ~ ~ ~ kill @e[type=armor_stand,tag=mil]\"}"},{id:commandblock_minecart,Command:"blockdata ~-3 ~-1 ~1 {auto:1,Command:\"execute @e[type=bat,name=Stop] ~ ~ ~ scoreboard objectives remove milisec\"}"},{id:commandblock_minecart,Command:"blockdata ~-4 ~-1 ~1 {auto:1,Command:\"scoreboard players reset @e[type=armor_stand,tag=min,score_minutes_min=60] minutes\"}"},{id:commandblock_minecart,Command:"blockdata ~-5 ~-1 ~1 {auto:1,Command:\"execute @e[type=armor_stand,tag=min,score_minutes_min=60] ~ ~ ~ scoreboard players remove Minutes: Stopwatch 60\"}"},{id:commandblock_minecart,Command:"blockdata ~-6 ~-1 ~1 {auto:1,Command:\"execute @e[type=armor_stand,tag=min,score_minutes_min=60] ~ ~ ~ scoreboard players add Hours: Stopwatch 1\"}"},{id:commandblock_minecart,Command:"blockdata ~-7 ~-1 ~1 {auto:1,Command:\"execute @e[type=armor_stand,tag=min,score_minutes_min=60] ~ ~ ~ scoreboard players add @e[type=armor_stand,tag=hou] hours 1\"}"},{id:commandblock_minecart,Command:"blockdata ~-7 ~-1 ~ {auto:1,Command:\"scoreboard players reset @e[type=armor_stand,tag=sec,score_seconds_min=60] seconds\"}"},{id:commandblock_minecart,Command:"blockdata ~-6 ~-1 ~ {auto:1,Command:\"execute @e[type=armor_stand,tag=sec,score_seconds_min=60] ~ ~ ~ scoreboard players remove Seconds: Stopwatch 60\"}"},{id:commandblock_minecart,Command:"blockdata ~-5 ~-1 ~ {auto:1,Command:\"execute @e[type=armor_stand,tag=sec,score_seconds_min=60] ~ ~ ~ scoreboard players add Minutes: Stopwatch 1\"}"},{id:commandblock_minecart,Command:"blockdata ~-4 ~-1 ~ {auto:1,Command:\"execute @e[type=armor_stand,tag=sec,score_seconds_min=60] ~ ~ ~ scoreboard players add @e[type=armor_stand,tag=min] minutes 1\"}"},{id:commandblock_minecart,Command:"blockdata ~-3 ~-1 ~ {auto:1,Command:\"scoreboard players reset @e[type=armor_stand,tag=mil,score_milisec_min=20] milisec\"}"},{id:commandblock_minecart,Command:"blockdata ~-3 ~-1 ~-1 {auto:1,Command:\"execute @e[type=armor_stand,tag=mil,score_milisec_min=20] ~ ~ ~ scoreboard players add Seconds: Stopwatch 1\"}"},{id:commandblock_minecart,Command:"blockdata ~-4 ~-1 ~-1 {auto:1,Command:\"execute @e[type=armor_stand,tag=mil,score_milisec_min=20] ~ ~ ~ scoreboard players add @e[type=armor_stand,tag=sec] seconds 1\"}"},{id:commandblock_minecart,Command:"blockdata ~-5 ~-1 ~-1 {auto:1,Command:\"scoreboard players add @e[type=armor_stand,tag=mil] milisec 1\"}"},{id:commandblock_minecart,Command:"blockdata ~-6 ~-1 ~-1 {auto:1,Command:\"kill @e[type=bat,name=Start]\"}"},{id:commandblock_minecart,Command:"blockdata ~-7 ~-1 ~-1 {auto:1,Command:\"execute @e[type=bat,name=Start] ~ ~ ~ give @p spawn_egg 1 65 {display:{Name:\\\"Stop\\\"},EntityTag:{id:\\\"bat\\\"}}\"}"},{id:commandblock_minecart,Command:"blockdata ~-7 ~-2 ~-1 {auto:1,Command:\"execute @e[type=bat,name=Start] ~ ~ ~ clear @p spawn_egg 65 1 {display:{Name:Start}}\"}"},{id:commandblock_minecart,Command:"blockdata ~-6 ~-2 ~-1 {auto:1,Command:\"execute @e[type=bat,name=Start] ~ ~ ~ scoreboard players add Hours: Stopwatch 0\"}"},{id:commandblock_minecart,Command:"blockdata ~-5 ~-2 ~-1 {auto:1,Command:\"execute @e[type=bat,name=Start] ~ ~ ~ scoreboard players add Minutes: Stopwatch 0\"}"},{id:commandblock_minecart,Command:"blockdata ~-4 ~-2 ~-1 {auto:1,Command:\"execute @e[type=bat,name=Start] ~ ~ ~ scoreboard players add Seconds: Stopwatch 0\"}"},{id:commandblock_minecart,Command:"blockdata ~-3 ~-2 ~-1 {auto:1,Command:\"execute @e[type=Bat,name=Start] ~ ~ ~ scoreboard objectives setdisplay sidebar Stopwatch\"}"},{id:commandblock_minecart,Command:"blockdata ~-3 ~-2 ~ {auto:1,Command:\"execute @e[type=bat,name=Start] ~ ~ ~ summon armor_stand ~-1 ~10 ~ {NoGravity:1,Invisible:1,Tags:[\\\"hou\\\"]}\"}"},{id:commandblock_minecart,Command:"blockdata ~-4 ~-2 ~ {auto:1,Command:\"execute @e[type=bat,name=Start] ~ ~ ~ scoreboard objectives add hours dummy\"}"},{id:commandblock_minecart,Command:"blockdata ~-5 ~-2 ~ {auto:1,Command:\"execute @e[type=bat,name=Start] ~ ~ ~ summon armor_stand ~ ~10 ~ {NoGravity:1,Invisible:1,Tags:[\\\"min\\\"]}\"}"},{id:commandblock_minecart,Command:"blockdata ~-6 ~-2 ~ {auto:1,Command:\"execute @e[type=bat,name=Start] ~ ~ ~ scoreboard objectives add minutes dummy\"}"},{id:commandblock_minecart,Command:"blockdata ~-7 ~-2 ~ {auto:1,Command:\"execute @e[type=bat,name=Start] ~ ~ ~ summon armor_stand ~1 ~10 ~ {NoGravity:1,Invisible:1,Tags:[\\\"sec\\\"]}\"}"},{id:commandblock_minecart,Command:"blockdata ~-7 ~-2 ~1 {auto:1,Command:\"execute @e[type=bat,name=Start] ~ ~ ~ scoreboard objectives add seconds dummy\"}"},{id:commandblock_minecart,Command:"blockdata ~-6 ~-2 ~1 {auto:1,Command:\"execute @e[type=bat,name=Start] ~ ~ ~ summon armor_stand ~2 ~10 ~ {NoGravity:1,Invisible:1,Tags:[\\\"mil\\\"]}\"}"},{id:commandblock_minecart,Command:"blockdata ~-5 ~-2 ~1 {auto:1,Command:\"execute @e[type=bat,name=Start] ~ ~ ~ scoreboard objectives add milisec dummy\"}"},{id:commandblock_minecart,Command:"blockdata ~-4 ~-2 ~1 {auto:1,Command:\"execute @e[type=bat,name=Start] ~ ~ ~ scoreboard objectives add Stopwatch dummy\"}"},{id:commandblock_minecart,Command:"blockdata ~-3 ~-2 ~1 {auto:1,Command:\"execute @e[type=bat,name=Start] ~ ~ ~ scoreboard objectives remove Stopwatch \"}"},{id:commandblock_minecart,Command:"setblock ~ ~ ~1 command_block 0 0 {Command:\"fill ~ ~-3 ~-1 ~ ~ ~ air\"}"},{id:commandblock_minecart,Command:"setblock ~ ~-1 ~1 redstone_block"},{id:commandblock_minecart,Command:"kill @e[type=commandblock_minecart,r=1]"}]}]}]}