10 hours and 45 minutes.
6
7
8 hours.
Ten hours.
12 hours 30 minutes.
10 hours and 15 minutes.
9 hours
7:45 am to 6:15 pm is 10 hours 15 minutes (101/4 hours)
Ten Hours
There are 10.25+24k where k is an integer.
From 8am to 6:15pm is 10 hours and 15 minutes.
10.5 + 24*k hours where k is any integer.