I have read many things about timing and frequency with regard to pump use for rehab. I utilize pump for 2 minute erections 4-5 times with a minute break in between. I had read this protocol from an Urology department somewhere. I also read that using your hand to masturbate the penis on rest periods essential. 35 strokes was suggested, purely for exercise not pleasure. Helps return blood flow and exercise tissue. This made sense to me and has helped