> I've got an internal alarm that starts to go off somewhere around 72 hours.

Nah, in my experience, if you've got good commit hygiene you can often merge even ancient commits.

Here's a pretty hefty commit I merged five years after it was originally written, converting a ~100k line codebase from GTK to SDL2, written in 2015, committed in 2020, with tons of development in between, with "10 files changed, 777 insertions(+), 804 deletions(-)"

https://github.com/smcameron/space-nerds-in-space/commit/4ab...

I was expecting it to be a bit of a nightmare, but it really wasn't bad at all.