Can't machines work a 7-day, 24-hour schedule? That said, humanoid robots strike me as a jack-of-all-trades tool, our environment is full of things that are optimized for human-sized and -shaped users, but if you can purpose-build your robot for a factory, it's going to be more efficient at a narrow set of tasks there.

That is the humanoid robot use case with time for charging, maintenance, and offline during repair. This is just a rough estimate of amortizing those costs and comparing them against a 7-day work week.