“I don’t do anything that has a zero percent chance of getting put on my gravestone.” [Don’t know the source]
This is a bit extreme, but it’s true that I often fritter away my time, doing stuff that’s addicting but not really meaningful. It’s fine to do this stuff (facebook, email, tv) to relax, but there’s an addictive property to these things that can distract from doing better stuff.
How fast?