A conservative estimate would be in the vicinity of 40 - 60 actual shop hours. This presumes a total player rebuild. Proper procedure and repair techniques are time consuming. Obtaining replacement parts is often a futile endeavor, with some parts requiring remanufacture in your shop. What is the name brand of your player, and do you know what type of player action in contains. A good source of information would be Player Piano Co. of Wichita, KS, USA. Some player actions are not economically feasible to rebuild. Some investigation before hand is strongly suggested. Hershman Piano Service Dennis Hershman
This PTG archive page provided courtesy of Moy Piano Service, LLC