It depends on what the show is and how seriously I take it, I guess. For something like Aikatsu (which I've only translated about 30 episodes of in total), it's usually about two hours, while for most other shows, it's more like three to five hours ever since I started doing two passes. It's hard to measure though, since I get distracted a lot.
Empirically, no.
No, should I?
No but can you get me Xythar's autograph
Humanity won't ever extinct because I will never die?
Miya.
Nekogirl.
Competition existing is pretty much the main reason I like fansubs. The concept of multiple competing translations existing for a thing is just really cool, and I love arguments about which releases are better.
Though I don't think I ever subbed something to be competitive about it.
Yes.
Show to chill are even worse because I have to be all intensed up to watch them just so I can chill!
Long ago were the days when I used Minami-ke as a sleep aid...
You have to pay attention to what's happening or you risk not knowing what happened, and you need to be in arts-appreciation mode in order to optimally extract enjoyment. Being in arts-appreciation mode takes energy and I don't like playing suboptimally, so it's hard.