Try this: . If that link goes dead (most of them do in time), then try Googling “1st Virtual Sexology and Hispanoamerican Sexual Education Congress, Madrid, Spain 2001” which should give some hits.
The study is published so it’s not going away. The results clearly show that the sample population produced length gains, which is what I am interested in, well beyond one thousand hours of extending. It also says something about the sample size being unreliable past about the fourth month as participants dropped out, but apparently it did not think the sample size was insufficient to draw more conclusions. I am out of statistics these days and need a review, but I believe certainty goes way down with under 25 or so samples, which means they probably had less persons in the population to study at that time. Makes sense, when you consider they were running the regimen for 10 hours 7 days a week for months on end, that’s a lot of time with a contraption attached to your dick and even some of the most ardent users would probably get tired of it after a few months and dropped out of the study. Those who stuck it out almost certainly were still seeing gains which is why they kept going past 3-4 months. That would have skewed the sample and made you think anyone who sticks it out will gain on to infinity, which may not be the case at all.
I suspect that many men stop gaining at about an inch of length gains due mostly to the ligaments getting tapped out. That would certainly fit my experience working on my penis 1100 hours at this point. After about 750 hours it was very slow going and still is. The interesting takeaway from the Madrid study is that “some specimens” were able to continue growing past one inch at around 1,000 hours and continued progressing all the way to 2 inches and 2,000 hours when the study concluded. The big question is, does this possibility exist for all male penises and why. I have not done a ton of study of penis anatomy but my understanding is that tunica growth is not possible for all penises, which is where subsequent growth would need to come from.