It's A REAL DANGER "Air Canada Flier Says Lack of Legroom Almost Killed Him"

In this case they wouldn't allow him to stand up for much at all it's important that you take time to walk up and down the aisle maybe stand in the back for a little while to stretch your legs

"The
World Health Organization says anyone who travels in a cramped space for more than four hours is at risk; the CDC cites the same number of hours.
Air Canada said in a statement ..."

http://www.newser.com/story/225890/plane-passenger-says-lack-of-legroom-almost-killed-him.html

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