I romanticized that kind of work, but I think my limit is roughly what you said at around 2 weeks. The novelty wears off. Especially because I miss my kids a lot after a few days.
Actually, another big one: I love cooking. When you eat what you're given and don't have a choice, even if the food is pretty good it's kind of... I don't know... I really just want to go home and make something that is distinctly 'my food', something I would only have at home.
Even so, I absolutely love field work. The stuff I do is nowhere near as crazy as the Antarctic. I'm typically on the semi-remote islands of the British Columbia coast. My wife goes to the Arctic; her experience is probably more like yours. Lots of time isolated on icebreakers. Occasionally visiting remote navy or military bases, though. Some indigenous communities. Not as middle-of-nowhere as the Antarctic! The longest she has done is 7 weeks, with ~4 days off of the ship.
Not right now though! https://www.usap.gov/videoclipsandmaps/spwebcam.cfm
Anyway, I'd love to do it again
While there is some romantic imagery (penguins!) down there, and the disconnect from the rest of the world might be appealing, for large parts of the year you’re just stuck inside.