Ok I have a fair amount of experience with the traction extenders. I have the same one, or very similar, that you use from Monkeybar. I can say that I haven’t used it all that much but it does function well, and it’s the same concept as a regular extender albeit using vacuum force to induce the stretch..
A few years back I had used a Jes, which is the same parts basically except it don’t use the sleeve/vac, it was a noose style that you tighten behind the glans to hold the traction stretch. I wore this thing as much as possible for months straight, and it did bring me some length.. But I’ve always gotten the cold glans thing going on after a few minutes of wearing it, no matter what I found it was unavoidable. I used padding, I switched to a comfort Velcro strap.. My glans would eventually become cold and purple.
I think part of it is the way your penis is “built”. I have large prominent glans, so even flaccid if I grip behind the head and squeeze, they engorge. I wore mine up to 10 hours per day sometimes. I have no issues with loss of sensitivity or anything from it. I don’t think you need to take breaks every 20 minutes, this isn’t like hanging, you want constant and consistent traction. But like any PE, you start out slow, lowest force, a few hours, and over a few weeks gradually add more of both.
I wore mine a lot at work. And unless you just sit at home all day it will be hard to get the hours in especially if you’re taking constant breaks. I can say that these things aren’t always comfortable, in fact, sometimes it will be downright painful and you need relief NOW lol. This is when I’d give it a break. And you think you killed your dick but after a minute or two of shake outs it looks and feels fine and back into the torture device it goes lol.
In all seriousness, it depends on you I think and how tolerant and sensitive your penis is. I could sometimes forget I’m wearing it for a few hours and rest when I have to piss. Other times (usually after many days/hours) it would become bothersome after about an hour and I’d have to rest. I’d always try to make at least an hour. Really, you have to “listen to your dick”, I can put my penis through a pretty good beating and still get good PI’s, but that don’t mean anyone can.
Like I said, I don’t have a whole lot of experience with the vac hanger, I could tell that like anything though, it takes some getting used to, till you get things fast and consistent with the device and find that sweet spot in the stretch. Just do what feels right and comfortable and if it starts to HURT at the head, take it off and rest. Almost any PE stuff I do, for me, makes my glans swell and in the case of any hanging/extender, they will get cold also.