It takes me about 4.5-5 minutes to make potato chips. I only use one layer of the racks at a time -- I have to keep rotating and adding more time when I stack one on top of the other, I find it takes way too much monitoring and checking and they don't really cook as evenly. So for me, doing one...
I wouldn't use hand sanitizer before touching food. Even after it's dry, if you lick your finger you can taste it. I would think that means it could rub off on the food.