10 and 1/2
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Assuming that's from 10:45 to 8pm: 60 mins = 1 hour 10:45 to 11:00 is 15 mins = 15/60 hours = 1/4 hours 11:00 to 8pm is 11:00 to 20:00 which is 9 hours → total time is 9 1/4 hours.
9 hours 30 minutes
From 3 AM to 8 PM, there are 17 hours. This is calculated by counting the hours from 3 AM to 12 PM (noon), which is 9 hours, and then adding the 8 hours from 12 PM to 8 PM.
12pm - 9am = 3 hours; 12:30 - 9:30 = 3 hours
9:30am to 5:30pm the same day is eight hours.