There was a time not all that long ago when cleaning a carpet was so difficult that it made lots of people avoid buying carpets in the first place. Carpets needed to be washed similar to other clothes back then and that basically meant that it could be a process that would take several days to complete at the very least. There is a pretty good chance that modern carpet cleaning methods do not require quite as much time, although there will still be a wait that you would have to go through if you want to avoid mold or bacteria starting to grow within the still moist fibers.
When you contact carpet cleaning service League City, the first thing that they would tell you is that they recommend steam cleaning for your rug. This is because of the fact that steam cleaning is effective but even more importantly it does not leave your carpet soaking wet. Quite on the contrary, your carpet would only be somewhat damp after it has been steam cleaned, but the fact of the matter is that you would still need to wait at least a few hours so that this dampness can be released into the air in the form of water vapor.
The fact of the matter is that most would recommend that you wait a full day before bringing your carpet back into your room. Twenty four hours is necessary especially if you live in colder parts of the world where moisture tends to stay right where it is instead of drying up. You can make do with twelve hours if you live in a hotter area, though.