9:30am to 5:30pm the same day is eight hours.
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1275
9 hours 30 minutes
12pm - 9am = 3 hours; 12:30 - 9:30 = 3 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
It is 570 minutes.