Edging, taking frequent breaks, or maybe a cock ring (only if the sleeve is not too tight), and a less intense sleeve. I was using fleshlight launch before and im able to last around 2hrs over time. But now that i have the osr, im finding it hard to last 20mins and have to take a break. Its insane. You just gotta keep doing it til you get used to it. Also, i find myself lasting longer on faster rapid thrusting scenes than the slow sensual movements. I think my unga bunga brain gets overwhelmed and gets numb to the sensation if its too fast. If its slow, my brain can catch up and process everything and i end up struggling to last longer. Its weird. It could be the other way around. Play around what type of material fits you ajd you can even script stuff that you like.