How many hours is 945 AM to 445 AM?

To calculate the hours from 9:45 AM to 4:45 AM the next day, you first count the hours from 9:45 AM to midnight, which is 14 hours and 15 minutes. Then, from midnight to 4:45 AM, there are an additional 4 hours and 45 minutes. In total, that adds up to 19 hours.