I once did a five day cruise. Only cruise I’ve ever been on, and by day three the novelty wore off. On the fifth day, I was glad to be off the ship and I have no interest in ever going on another. It was a fun time for a bit and I have some good memories about it, but I also remember how it started to feel monotonous and boring.
Cruising for that long would feel like being trapped in a shopping mall surrounded by staff with plastic smiles and justified hate in their eyes. I can’t imagine enjoying it unless I was a sociopath.