Simple. If the car still under warranty, follow the maintenance schedule by manufacture. If out of warranty, follow your own schedule. In general, full synthetic oil change interval is 10,000 miles, regular oil is 3-5000 miles. Take your pick. But if you always only drive 5-10 miles (or under 20 minutes), watch out for excessive moisture absorbed in engine oil and cause sludge. To avoid this, run engine at least 20 minutes to make sure all moisture in engine oil escape from exhaust once every couple days.
I think it would be a great idea if the usage of conventional and/or full synthetic oil is taken into consideration. These oils have different maintenance periods.