Humm...probably it will hold 1500 rpm.....over that I don't think so
My guess is that the metal sheet used is aluminum.....at high revs for long periods of time that thing will heat up a whole lot.....the aluminum will probably melt! Besides that....unless the hair drier is made out of steel, titanium, inconal....or some other kind of alloy I don't think it will withstand high tempretures....the hair driers I've used usually are made out of plastic....!