It's more like 7 hours a day to be anywhere near competitive at DotA.
By "competitive" in that context I meant "won't get stomped at 1.5k MMR". Which is still, frankly, a pretty high bar compared to most games.
But yes. If you want to be actually competitive at a tournament level, you're dead on.
I see. Yeah, 7 hours of fitness a week on a casual level would do wonders for a lot of people, me included.
The first DOTA or Counterstrike equivalent for VR that also rewards fitness with increased game ability will unleash a legion of very, very fit competitive gamers on the world.
Bearing in mind - 7 hr a week is more or less the minimum to be at all competitive at DOTA, for example. 7 hr of intense exercise a week will get you pretty fit.