scoreboard players remove @s[scores={treadmill.timer=1..}] treadmill.timer 1
scoreboard players operation @s treadmill.timer.secs = @s treadmill.timer
scoreboard players operation @s treadmill.timer.secs /= .ticktosec treadmill.timer
data merge entity @s {text:'{"score":{"name":"@s","objective":"treadmill.timer.secs"},"color":"dark_green"}'}