This works out perfectly for me. I started watching the anime a few months ago, but I lost steam around halfway through, so this gives me some time to take a break before catching up!
3, but yeah. I'd have them on while I was working since the pacing is pretty easy to follow. Plus I'd read the manga back in the early 2000's, so I could remember the major plot points well enough without needing to devote my full attention.
Well usually it's supposed to take less than a month so he's not really doing anything impressive. 12 days of watch time when there are 30 days in a month. Assuming you sleep for 8 hours, you even have around 4 hours left for various activities!