For me once every 7 years. And counting. Probably 7 1/2 by now. I started going to semi legit spas about 7 years ago. Now I don't care if the clock keeps ticking to 8. I now get "massages" twice a week, and by back scrubbed in the shower (twice a week).Don't worry, you still have a problem (if it makes you feel better). Mine might just slightly be worse.