How many hours between 830 am to 1100 pm?

To calculate the hours between 8:30 AM and 11:00 PM, first convert both times to a 24-hour format. 8:30 AM is 08:30 and 11:00 PM is 23:00. The difference between 23:00 and 08:30 is 14 hours and 30 minutes, or 14.5 hours.