Hi Rabi,
As Mr. Pranneth said go ahead with the design.
Along with this use the counter that if
as 0.5 if late coming would be 78 - 2 hours = 1/2 day
1 if late coming would be 2 - 4 hours = 1 day
1.5 if late coming would be 4 - 6 hours = 1&1/2
2 if late coming would be 6 - 8 hours = 2 Days
more then 8 hours = LWP (how many day's for lwp).
All counter value will be stored in the time type and deduction after from respective quota in the sequential order.
Hope so you got it.
Regards,
Sankarsan