Just as you can go too hard on getting sucked into social media and other vices, you can definitely over-optimise your time and turn into a robot as well.

Maybe it's important for your sanity to spend two hours a day reading Wikipedia articles about the Wehrmacht or playing Age of Empires 2. Then again, maybe it's not. But approaching your habits from an overly logical, optimisation-focused point of view will destroy your soul. You are a biologically-evolved animal; not an intellectual abstraction.