After nearly 15 years of pumping and jelquing, I now only pump once a day in the morning for girth maintenance. After situps, pushups and a banana, I pump my cock for 20 minutes while showering, shaving, drying my hair and brushing my teeth. Will generally maintain that girth for most of an 8 hour day, irrespective of whether I have sex, jackoff or ejaculate. I also pump for fun with some buddies a few times per month and those are generally more than a single 20 minute session. There have been times when I've had as many as 3 blowjobs or other encounters within 6 to 8 hours of pumping and never had any problem getting an erection or ejaculating.