I had pumped up my extender length quite a bit and the spring cylinders were 30-40% compressed (2 weeks or so). I just couldn't hack it. My penis was exhausted after 3hrs. I also had a gut feeling the more tension was causing me to hit a wall (especially only able to tolerate 3hrs a day). So I am now going back to lower tension and the usual 7-8hrs a day I was getting. I am now extending just until the springs begin to compress. I seem to feel a decent enough pull and can do much longer sessions. I will report back in a month or so with my findings.