9 hours.
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It is 21 hours.Note: 10 am to 10 pm is 12 hours, 10 pm to 7 am is 9 hours, 12 + 9 = 21
That depends upon which 11:10 and which 7:00 you mean: 11:10 am to 7:00 pm is 7 hours 50 minutes 11:10 am to 7:00 am (the next day) is 19 hours 50 minutes 11:10 pm to 7:00 am (the next day) is 7 hours 50 minutes 11:00 pm to 7:00 pm (the next day) is 19 hours 50 minutes. (Using 24 hour notation or including am/pm removes this ambiguity.)
There are 17 hours between 2 am and 7 pm.
It is seven hours from 9 AM to 4 PM.
8 hours.