Hi Cari, You do not necessarily need to keep it running to dry it, but this is the easiest way. Once it deflates, it will fold in on itself, trapping moisture in the folds. Inflated, virtually all the surfaces are exposed to air, and the air moving through the inflatable will also help it dry. The amount of time it takes to dry after use really depends on ambient temperature and humidity. In dry heat, it can really dry in just a few minutes. In cool, damp climates, it will take substantially longer. First, step on the pool wall to drain the water, then you can use a towel to remove additional water from the surface. This will substantially shorten the drying time. Sincerely, Blast Zone Support