i think technically it can be very long, but i think at a certain length u might be having some communication problems between yer cock head and yer brain, not sure if tehre is a limit. Some people say its impossible to even grow yer dick, I am skeptical by nature, very skeptical, but from both sides.. From my research, ive done searches on google and otgher search engines with "why penis stretchers dont work" and could not find one single medical article as to why they dont work, only opinions, whereas when i do a search on stretchers in general, at least wikipedia and WeBathmated both refer to at least two studies performed that prove stretching works, and I dont see why it wouldnt work, u stretch anything enough it will grow, as far as how it will function is a diffrent story, and I think there are also limits in girth gains, lenght is one thing, but girth is a diffrent deal.. but im stil new to all this stuff so who knows. lol
-k