Customers always ask how long will it take for a carpet to dry? I'm sure you've read the "dries in an hour" ads from the Chem companies
( these are not extraction companies so they can't apply any deep cleaning techniques as they wouldn't be able to dry the carpet).
There is no exact answer as every carpet has its own density and degree of soil ,combined with the time of year, the days temperature, humidity, if your heat is on or air conditioning. Also if it is a basement that is being cleaned, however the other factors to consider is 1.