Side projects on my laptop in one language I use is currently about 200k lines (as measured by "wc -l" so includes blank lines and such). This covers about a decade and a half. This doesn't count all the lines added/changed/removed in the history, a few other languages I use, or anything for work.

Including all those other excluded things, I could see a million per decade across all languages and personal/work projects pretty easily for myself.