I have two Kenmores that offer air, low, and high heat. I almost never use the low heat. The dryer in the house, a 6.8 cu. ft. model, on a full load takes 45 to 50 minutes. The dryer in the garage is a 6.9 cu ft. machine and takes about 5 minutes longer in the winter and 5 minutes less in the summer. This has to do with the temps in the garage vs. in the house and the weight of the laundry. I use it all summer long to keep the heat out of the house, which competes with the air conditioning, and vice versa in the fall/winter.
Gordon