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.
3pm to 10pm is 7 hours.
6 hours from 4pm to 10pm
13
3 hours between 12pm and 3pm
Typically, chefs work from About 3pm, when restaurants open for dinner until 11pm, which is typically when they close. Hours can range from 11am till midnight (which is where I work) to 3pm to 10pm. They all depend on the type of establishment and whether or not you own it.
24 of course !
6 hours
2 hours
5 hours
14 hours
9 hours
19 hours.