I feel like I am going absolutely nuts reading this thread. 10K LoC is 2-3 months of work for a single person hobby project. 100K LoC is maybe a 2-3 person dev team for 2 years. That's assuming a refactored codebase with no copy-paste repetition. "Append only" codebases with heavy copy-pasting can easily get larger than that in shorter amounts of time.
Huge teams and decades of time gets you to 1M+ range, not the 100K+ range.