Guys you should really be on the safe side of things on this, I'd say stick with 10-15 minute sets! Depending on how tight you clamp the [words=http://www.mattersofsize.com/forum/showthread.php?83577-Length-master-official-order-thread-now-shipping-06-16-2014!!!]
LM[/words] chamber, circulation gets cut off really bad. Just do more sets and stay safe