I’d say a year is OK. If you drive 2 miles daily, then the oil should be changed yearly. If you drive 60 miles once a week you might go for a few months more than a year.
The answer to the question depends a lot on how drive the car? Were those 500 miles mostly on a highway and on trips of more than 30 min.? Or, were they to town for food, like 2 miles and 5 or 10 min. trips?