Hours, Minutes and Seconds...

P7 : 711 hrs
     x  60 mins = 42, 660 mins = 2, 559, 600 secs.
P4 : 759 hrs
     x  60 mins = 45, 540 mins = 2, 732, 400 secs.
P2 : 879 hrs
     x  60 mins = 52, 740 mins = 3, 164, 400 secs.

Using 711 hrs,
Sleeping time = Approx. 232 hrs.
Revision classes = Approx. 52 hrs.
Miscellaneous = Approx. 190 hrs.
Balance = Approx. 237 hrs = 14, 220 mins = 853, 200 secs.