There are 25.625 days in 615 hours because 1 day = 24 hours
ten
10 hours and 45 minutes.
6:15am to 9am is 2 hours and 45 minutes.
From 8am to 6:15pm is 10 hours and 15 minutes.
There are 10.25+24k where k is an integer.
2:20
10 hrs and 15 mins
6:15am to 5pm is 10 hours and 45 minutes.
8.5 + 24k hours where k is any integer.
7:45 am to 6:15 pm is 10 hours 15 minutes (101/4 hours)
There are 9 and 1/2 hours between 8:45 am and 6:15 pm.