How Much is to Much?

How much knitting is to much right now for me. Apparently 3 hours.  Don’t get me wrong my hand did fine.  It just that my last arthritis flare up left me with some sore tendons in my right shoulder.  Spinning seemed to helpful, but I can not figure out why my Lendrum DT has squeaky treadles. I am wondering if I have worn out some parts. I may just have to Google that one.  Although if you have the answer please let me know.  Otherwise, I might have to spin in another room.