I'm sure we all know by now that there is a certain number of hours you can work per week before efficiency goes downhill. Even if you don't feel it, it's happening.<p>Sadly, this post doesn't use any real data, but instead uses an anecdote about playing a video game too long.<p>Also 'too much' by definition is damaging. If it wasn't 'too much' then it wouldn't be bad. By definition.