I don't think it's half a day to get proficient, it's half a day to hack something half working together so they're unblocked and can do the other stuff they want to do.
And then another half a day to get pissed off because you don't remember what settings are/are not in your venv and trying to exit and/or get back into the venv (assuming no prior experience with venv)
Fundamentally venv breaks your conceptions of what a shell is through cleverness, and that's a problem for people who are new.
