I work for the New York City Department of Sanitation and my boots are always getting wet from rain, Puddles of water and Leaking garbage. After I hose off my boots and stick in the boot dryers depending on how wet my boots are it can take 8 to12 hours but i have used them after only 4 hours and they were Pretty dry very happy  with them. The Boot dryers seems to be made very well They don't feel cheap. I've used my boot dryers for over six months now and they are still working fine. for the price you have nothing to lose I recommend them.