Mine can last up 2 to 4 hours I do nothing except for lay in the bed and let it go my breakthroughs come when I relax I can never relax fully if I can explain to you what this pain feel like firecrackers going off in my legs upper body searing burning pain stabbing with a knife the bottom of the feet top of my hands headaches real bad that's all I can say real real bad when the pain goes down from Red to about 5 I can take medications so I can tolerate the rest

I never know when it really ends, I always feel better when I can finally can go to bed and relax.