Cascade,
You don’t have to be a pumper or a hanger to benefit from this wrap. After a brief jelq session to pump things up a bit, you can also use the velcro wrap to maintain the engorgement for an extended period of time. On weekends when I usually take a break from pumping (since the family’s all home), I’ll do a few jelqs and then wrap the base of my dick. The result is a firm but pliable erection which has the effect of keeping my cock stretched and full for however long I wear the wrap. By wearing my loose denim shorts, the zucchini down my leg can be kept secret to all but myself.
Depending on how tight I wrapped, I have gone for an hour at a time without taking it off. I just prefer inspecting myself and my dick circulation more frequently to be on the safe side, especially if I have chosen to wrap a little tighter than normal.
Putting the velcro wrap on an hour or two after your PE routines and removing before you sleep would be an appropriate use. Just be sure to do some jelqs and/or squeezes and/or slap your dick on your thighs several times to increase the circulation anytime after you remove the wrap.
I would never recommend putting on this wrap or any other variety and going to sleep with it on. It is always better to be safe than sorry. This wrap is relatively problem free with sensible wrapping pressure and periodic inspection for circulation.
Peforeal
Note: If you are using the velcro wrap to wrap around both your ballsac and dick at the same time, then the pressure on the penis will be more dispersed. You can wear the wrap this way for much longer periods of time without the need to remove it as frequently. The result using it this way is a nice moderate stretch on your cock and a good way to stretch out the ballsac.