Your question has no answer because there is no time from 10pm to 3pm. If you mean 3 am it would be 7 hours. Unless you were asking about 3pm the next day, but your question gives us no clue that is what you are asking.
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My mistake; I previously read the question incorrectly.
22:00 (10 PM) to 15:00 (3 PM) the following day is 17 hours.