I've been doing it wrong for years. Never bothered with blowers when cleaning and I've mysteriously built a very large repeat, customer base, from which I have never had a return, or complaint about slow drying.
My drying times, without blowers, are usually 1-2 hours ( touch dry ) which is far better than average and totally dry, with the odd exception, within 3-4 hours.
This has proven completely acceptable to my clients and, indeed, they are often pleasantly surprised at my quick drying times.
Towel testing, gives a pretty accurate indication of the standard of cleanlieness and I don't promise what I can't deliver, although I always tell my clients, to expect, as good as, or better than, the well known franchise operators.
I have two blowers, which are rarely used.
robbie