I did a qoate last week where a previous carpet cleaner had told the customer the suite would take upto 24hrs to dry, he does'nt use turbo dryers.
I find most fabrics darken when wet so until the suite is dry you cannot tell if it's really clean. Often I will clean & dry the suite and then give it a final inspection, then I'll have to reclean some areas.
I cannot see why any carpet cleaner would not useT/D,
Although most T/D are the same, look for ones with 3 speeds, a carpet clamp & a tilting bar.
Mike