I think he means "killing time" away from work. If programming or tinkering with a pi does not feel like a hobby, then it wont help him recuperate from work.
I play games, paint and watch loads of documentaries to escape burn out(I am a 15hr coder-type). An escape helps prevent burn out and does well for your productivity. I cant say I have the best workplace but we do have an XBox with all accessories, a pool table, a table soccer table (lol) just to unwind.
I can definitely tell u that, that killing of time is great when u are crunching code. Companies like Google,Microsoft, Facebook, Amazon etc all have such recreational setups for good reasons. Though mine would be a wanna-be, I appreciate the purpose they serve to "kill time"