The number of hours between two times is calculated by subtracting the start time from the end time. To do this:

• Convert both times to a 24-hour format if they are not already.
• Subtract the starting time from the ending time.
• If there are minutes or seconds involved, convert them to decimal hours by dividing minutes by 60 and seconds by 3600, then add to the total hours.

For example, between 9:00 AM and 5:00 PM, there are 8 hours. Between 9:00 and 5:30 PM, there are 8.5 hours. If the start time is later than the end time, the calculation assumes the end time is on the next day (e.g., 6 PM to 8 AM is 14 hours).