How many hours are between 8am and 6pm? The easiest way is to divide the counting by midday. After that from 8:00 AM to 12:00 PM is 4 hours and from 12:00 PM to 6:00 PM is 6 hours. Now you just need to sum up these two numbers so it means 4:00 + 6:00 is 10 hours and that is answer to your question.Jan 2, 2019