Seriously, 400 lines of code is not much, the average source file is some 200-1000 LoC and a medium-sized project has maybe 50 such files. Sure, a whole project like that would be too much, but why wouldn't the site be able to take a 400 LoC post?

I guess it depends what the 400 lines contain. :-) I would personally skip boilerplate stuff to help readers focus on the important parts, but that might be a matter of formatting. It sounds like the asker might have run into an overall limit on post size; I'm not sure what that is, but I think 30,000 characters maybe? I'll have to check.

Monica Cellio‭ Well 400 lines of very compact and detailed code with lots of comments might go as far as 30k characters... maybe. If we are looking for some worst-case number, I'd say a reasonable upper limit might be something like 1k lines 80 characters each = 80k. Larger than that and it won't be fun to review for sure. 1k lines isn't unreasonable but 80k characters might be - code lines are usually not that long even in the most verbose languages like Java.

Lundin‭ What about a minimal reproducible example?

Zakk‭ This is about the code review category of this site so it doesn't apply.