I have a 56 pr 111 and I wind it on mon-wed-fri-sun.
After the initial excitement of winding it (I could have wind it every day just for the pleasure of it) I settled for the above mentioned schedule. Winding it on a daily basis, while beneficial to the accuracy of the watch, may have not been the best for the water resistance of the watch. And since I take it under water almost daily I had to settle for that.
But if you don't have that problem I'd say that winding it on a regular basis to keep it at 80 full may be optimal (just my thought, not scientifically proved ).