scoreboard objectives add run stat.playOneMinute

scoreboard players set @a[score_run_min=40] run 0

execute @e[score_run_min=10,score_run=10] ~ ~ ~ say 3
execute @e[score_run_min=20,score_run=20] ~ ~ ~ say 2
execute @e[score_run_min=30,score_run=30] ~ ~ ~ say 1
execute @e[score_run_min=40,score_run=40] ~ ~ ~ say START!