I work with a few tall women (Im no giant really, 5'5 or there-abouts). In particular a couple of them are about 5'10 and wear 4" heel knee length boots.
Makes them about the tallest people in the whole place but I dont hear about anyone complaining
Makes them about the tallest people in the whole place but I dont hear about anyone complaining

But I'd never give up my heels 
I don't know about practice, I think I need more foot! I'm a UK 5/EUR 38.
heels but made a slight miscalculation on my last pair, they turned out to be 5 inches and my feet are almost vertical in them. If they were any higher I would think there would be space between my heel and the inside of the shoe.