Yes, they do get crisp. It takes about 6 hours with an electric dehydrator and about 10 hours if you dry them outside. I have a Nesco dehydrator with 8 trays.
My boys built a solar dehydrator that has 6 trays. I usually dry my squash with the electric and save the solar for tomatoes. I usually wait until the chips are hard and crisp.
If you take them out with they still bend then they tend to develop mold on them, I assume there was still moisture in them. I also will use a food sealer to seal small bags for my Boy Scout troop for camping and hiking. Marsha