Earlier quoted context omitted.
as long as we paid the semester fee the university never bat an eye
Public universities usually give you a lot less time, think months, and one may also be constrained by visa allowances. Not sure if it's also the case in the US.
Just as long as you don't hit an administrative blocker, that is. In my case, I never submitted the thesis, because my request to extend the time coincided with the faculty being split in two and completely overhauled - so instead of extension, I was told that, because of "syllabus changes", I would need to repeat the entire MSc level (2 years) to be able to submit the thesis now. I politely declined.