In one test it took only a few hours before I had to reset the iPad to make its hotspot work properly again, while in another case it was only after 24 hours of continuous use that the feature began misbehaving. The iPad wasn't immune to this sort of behavior, it just seemed to happen less than on the Android tablets and smartphones that I've tested.

I've noticed all too often that Android hotspots will either stop routing traffic after an extended period of use, requiring either cycling the radio states on the hotspot device itself or in some cases a full reset of the hardware. In general the iPad's personal hotspot seems to be better behaved than similar options under Android.