Depends on the language, obviously. Some languages are more verbose than others, and relatedly, some languages force simple code structures that are less likely to become unmanageable.

I believe tinygrad still caps the total LoC in their repository to 10k

10,000 LOC, hell my LLM can do that in a day!

Current project has over 60,000 LOC, I find using an antagonistic agent code and architecture reviews are really handy for keeping things grounded.