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
12pm - 9am = 3 hours; 12:30 - 9:30 = 3 hours
9:30am to 5:30pm the same day is eight hours.
nine and a half 11 to 12 = 1 hour 12 to 9 = 9 hours 1 + 9 = 10 10 - 30 minutes = 9.5 hours 9 hours 30 minutes unless it is say 11am to 9am next day then 21.5 hours