It is 12 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
Ten hours.
There are 8 hours if it's on the same day
9 hours.
The time from 10 AM to 9 PM is 11 hours. You can calculate this by counting the hours from 10 AM to 9 PM, which includes 11 full hours.