I'm basing this on the articles about it. I've never personally seen it happen. I've seen people duck out to the bathroom to take phone calls and they don't seem to have run into any trouble over it; but where I work, the bathrooms aren't far from the floor.

If you have to go down four stories to get to the bathroom, on the other hand, it'd be pretty hard to maintain the rate, and if you don't maintain the rate you'll probably get written up for that.