[Grim_]

Under the /jail command you'll need to set a variable for the player to store the unix timestamp they got jailed on. Then, whenever they use the /time command, compare it by subtracting the unix time to that of the current one. Then you can use the function to convert the returned value to a hour:minuteecond format. All this information can be found in this topic: https://sampforum.blast.hk/showthread.php?tid=254915