What I mean is in the extreme case, there are only 24 hours in a day, so why would you waste the non-work/non-sleep stuff on something that isn't building a skill/making yourself better? "Whenever you're not practising, somebody else is. And when you two meet he will be better than you."
Now I imagine the guy meant frivolous stuff like watching netflix, playing video games (which are fun and entertaining, but not so practical unless you plan to be a pro gamer), watching tv. Which are a waste of time if you place it in the hierarchy of using that leisure time instead to start a business, write a book/blog, exercise, build a thing, etc - stuff to generate side income and/or doing dope shit.
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