Ask the shifts that currently run calls, likely each will give the impression they have the busiest. In my experience, many cardiac events occur early in the morning, when the extra stress of morning actives from a resting state places an extra burden on the heart. Overdoses, mainly at night. Trauma any time; motor vehicle accidents during rush hour in urban areas, farm accidents anytime, mountain rescues on weekends, trench rescues during work hours, building collapse and swift water rescues during violent storms. Check with the local department where you will run, their experiences maybe totally different. Pete