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Thanks for the great data pointI use a similar product. My boots are 3 years old, I've used the boot dryer on them probably ~100 times, and they're fine.
ETA: This is the one I have: Dr. Prepare Boot Dryer Shoe Dryer, Glove Dryer & Boot Warmer with Heat Blower, Portable Adjustable Rack and Timer, Folding Design & Quick Drying for Shoes, Gloves, Hats, Socks, Ski Boots I usually set the timer to 30 minutes, and then check the insides and give them another 5 minutes if needed. On a typical day in California, 30 minutes does the job, but sometimes if it's cold they need a little more time.
Mine stink. Currently soaking in water and baking soda. Usually stuff them with paper towels and change every other day until dry.I like to apply nondeterministic qunatum rules to my diving boots.
As long as I don't smell them I can't be sure if there is a sentient fungus living in them, so now I no longer worry about how dry they are.