15 hourse and 10 minuts
6:15am to 5pm is 10 hours and 45 minutes.
10 hours and 45 minutes.
It's 615 minutes ((60 * 10 + 15) minutes).
6:15am to 9am is 2 hours and 45 minutes.
2:20
From 8am to 6:15pm is 10 hours and 15 minutes.
8.5 + 24k hours where k is any integer.
From 6:15am to 1:30pm is 7 hours and 15 minutes.
2 hours, 25 minutes
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.
There are 25.625 days in 615 hours because 1 day = 24 hours