PirateSteve uses the Wench as an ADS and repeatedly said he can go for over six hours with healthy circulation. I should note that he uses no wrap, which I think plays a large role in being able to do this.
I have used the Wench ADS for over three hours at a clip myself. But because I have a lot of freedom I prefer to use that time to hang. So, I have relied on the findings of guys like Pirate and 789 to gauge the Wench’s effectiveness as an ADS.
Also, the Wench ADS these guys use is a hybrid of the original. The outer “male” velcro is substituted with a thinner and less irritating material - and the dimensions of the Wench are scaled down to make it more stealth.
I often like to use traction wrapping when I am out and about. More than just a way of healing while extended I consider it a bona fide ADS.
With practice and good sense anyone can learn how to traction wrap for extended periods of time.
Yesterday, I had jury duty and instead of using the Wench ADS (fear of being strip searched due to my politics) I wore an Ace bandage traction wrap at a pretty good stretched length. I was able to go the entire day in this state without ever thinking about it (except those times I found myself getting aroused being stuck in a room full of hot and frustrated Milfs.