its one of your agro control abilities.

whoops my bad I read the the title wrong.  I guess thats what ya get for doing too many things at once.  Thank you for correcting my ass Leishiu

It was originally 20 sec duration, what you might have read as 5 minute was my comment on it that it should be moved to 5 minute duration like all other classes taps; but it was apperenetly judged to powerful for that (I think it's because it uses Jin and their document states that no Jin fueled power may have long duration - obviously not a revised concept since the upped energy regen - but then again, that's just why I think they have weak durations on jin powers (except aums!), might have nothing to do with the truth). Steal the Wind however was moved to a proper 5 minute duration.
To be fair though, it deals rather decent damage (even though tooltip states otherwise) and has two other purposes (debuff and self-buff), so a 1 minute duration is alright.

You can stack any debuff by using various ranks of it. So you can get -60% mitigation (even though all mobs have about 20% and their insane self-buffs aren't affected) with all eagle claws and -660 strength or so with all deadly hands. Don't think you can stack Steal the Wind as counterattacks and finishers usually requires you to use the final version of it, but you could get yourself 25% haste (apperently the cap) and a -45% attack speed adjustment on the mob if it was possible.

I understand the jin based argument, but iron hands is a 5 min duration so I don't see how withering palm can't be.  As for stacking, you can not stack withering palm because you only get one version of it.

I have tried stacking deadly adder hand, however when stacked I seemed to still get hit just as much with all levels of deadly adder hand as I did if only one version of adder hand was on the mob.  The effect did not seem to stack.  Anyone have a different experience with this?