Could someone give me suggestions on how to use MS Access to track hours.

The input is start time and end time. Total hours/minutes worked needs to be calculated allowing the minutes to roll over to the hours if more then 59 minutes.

As it is, for example, total time is 6 hours and 90 minutes if someone worked 3 hours and 45 minutes one day, and 3 hours and 45 minutes another day.

What is the easiest way to handle timekeeping?