yesplumbers advice you to allow a reasonable curing time after a carpet steam clean. It is better to use the carpet after that. Further it cannot be said certainly. The dry time required depends on the weather, the thickness of carpet, and the level of soiled the carpet is. Some carpets dry under two hours while others may take three to six hours to dry completely. However, it also depends on air movers, Through keeping the windows open and turning ceiling fans on.