I just finished a two-day gig painting a few rooms of a house. It wasn't a difficult project, I mean, I never desired a CTRL-Z key at any point. XD
However, there were a few interesting challenges. The biggest one was trying to paint a room white and that room had a dark blue wall. It would need at minimum two coats, but I only had one coat's worth in the bucket. It was like squeezing blood from a rock... but I succeeded!

Well, with painting the room I mean. No blood was to be had...

Letex paint can be fickle thing. I had yellow-white paint go on brown with no need of a second coat, and then later I'd put a light blue on white and watch the blue bubble and expose the white underneith. Crazy!
The adventure was fun though!

Well, my sore legs might disagree however.