Depends on how you ride, if you dust your engine, drown your bike etc etc etc..
Some people swear by doing the piston and rings as a package every 60-70hrs. Others will do a set of rings around 50hrs, and then a full piston at 100hrs. There are pleanty who do 100hrs on a set of rings.
I pulled down my 2010 at 65hrs for a fresh piston and rings. Below are pictures of what I found.
Make what you want of it.