8 hours 30 minutes
16:30 - 08:00 = 08:30
or
4 (8 to 12) + 4.5 (12 to 4.5) = 8.5
8
8 hours
6 of them.
9 hours and 30 minutes.
5 hours and 30 minutes.
4 pm the same afternoon is 8 hours.
5.5
6 hours.
1 hour, 10 minutes
9.5
3 hours and 30 minutes.
5 hours and 15 minutes.