If you are flying a high-performance single, piston twin or turboprop, particularly if you use it for business trips, there is an increasing probability that you will get a notice from your insurer or employer requiring that you take annual recurrent training.
We did a survey of organizations that specialize in recurrent training and found that there are programs that satisfy insurance carrier demands that range from one to three days in length, are either simulator or airplane based, and range in price from as low as $500 for a piston single, to north of $2400 for turboprops.