I have about 75,000 miles on my car. When should I be changing my timing belt? on 2004 Chevrolet Malibu Maxx

My driving is mostly on the East End of Long Island, which is sparse suburban traffic (except this time of year!) In addition, I make three or four trips a year to upstate New York, approximately 750 miles each.

Doesn't have a timing belt. It has a timing chain that should last as long as the engine does! The accessory drive should be changed, if not already.