TimerScript

local changeTimerEvent = game.ReplicatedStorage:WaitForChild('ChangeTimerEvent')

-- Player start timer event that runs character function
function startTimerPlayer(player)

    player.CharacterAdded:Connect(startTimer)

end
game.Players.PlayerAdded:Connect(startTimerPlayer)

function startTimer(character)

    -- Variables and the initial event call
    local timer = 0
    local alive = true
    local player = game.Players:GetPlayerFromCharacter(character)

    changeTimerEvent:FireClient(player, timer)

    -- Function called when character dies
    local function onDeath()
        -- Best time leaderstats value
        local bestTime = player:FindFirstChild('leaderstats'):FindFirstChild('Best Time')

        -- If timer is better than best timechange best time
        if timer > bestTime.Value then
            bestTime.Value = timer
        end

        -- Reset variables
        timer = 0
        alive = false
    end
    character:WaitForChild('Humanoid').Died:Connect(onDeath)

    wait(1)

    -- Timer loop that increases while player is alive
    while alive do
        timer = timer + 1
        changeTimerEvent:FireClient(player, timer)
        wait(1)
    end

end