I had a planetwise liner that I always line dried and it delaminated at 8 months. I had 9 fuzzibunz delaminate after 6 months. They were dried in the dryer and line equally. Lastly, I had a PW wetbag delaminate around 10 or 11months dried exclusively in the dryer (probably hot).
So its hard to vote but I saw no pattern for us. I think it would also be hard to distinguish between dryers' hots and mediums. We have used three different dryers and one's low was as hot as my new dryers' hot. My mom's took three cycles on hot to get my inserts dry and mine takes one.