saving timers

how can i make an timer that works for 24 mins and if player quits in that time the time get's saved and when player joins the timer continue form same place

example

a timer is set to 24 mins and after 24 mins it again starts for the player

the player played 22 mins and left the server then the 2 mins timer get's saved in his data and when he joins the timer start form the same place he left

i think we would need then eunms for saving time idk float or integer then will the timer work with enums ??