As you turn up the temperature of the air dryer, it tends to dry quicker. Because the dryer is located in the back of the seat, the air has some distance to go before starting the dry.  For this reason, the further back you sit the better and quicker the bidet seat’s dryer will work. Due to the distance the air travels, the time it takes for the dryer to do it’s job may be longer than some individuals expect. For this reason, some people dab dry, some dab dry and follow it up with a air dryer dry, but some people do go completely toilet paper free as well. If you need a bidet seat for mobility reasons, having an air dryer is a must.  It may not instant, but it will get the job done.
Not all air dryers are equally as effective, the more expensive seats tend to have the best air dryers.  If you’re looking for the best bidet seats with air dryers for your toilet on the market, you’ll want to look at the high end TOTO units like the S550e, S500e or the Cascade 3000.