I think I started out with 15 minutes in the first week, was up to 30 minutes in the second and ended up with 45 minutes at the end of the first month (gained half an inch and waited another month to see if the gains were permanent [yes!]). During the second month I’ve stuck to 60 minutes mostly (almost another half inch). I’m now starting the third and haven’t considered upping at all, since I’m running out of good movies (currently I’m watching ~15 per month) :P
At the moment I’m going to try to cut my total time spent down to the actual 60 minutes of jelqing and then reconsider going for 75 minutes. This means keeping that 70% erection going no matter what. Difficult that.
Why the intense/long workout? I didn’t really want to believe PE worked until I saw the results for myself on myself and since I hadn’t experienced any injuries so far, I took the plunge and ‘worked hard, PE hard’ from the start. I still can’t believe people see any gains from doing ‘only’ stretches or ‘only’ jelqs for only 10 minutes a day. That’s the time I just sit in front of my infra-red lamp before/during/after a PE session for keeping it warm.
I think what you mean by ‘intensity’ is actually: duration, variety and intensity. I think it’s vital to balance those three even when hanging for example — you could consider different hanging positions, angles, weights etc for a start. Anything to avoid numbness and too much of a deadlock is good, I suppose.
On ‘keeping it down’: I’m having this problem while stretching, it’s a real pain in the ass. V-stretches work sometimes, as Bird2 said. Squashing the glans helps, too. If you find a solution to this one, please let me know.