I spent 1-3 hours every other Friday for six months writing a three line monkey patch to fix a (lack of) clipping bug in a drag and drop library that wasn't taking PRs because they were going to rewrite everything (and were 18 months into a 1 year rewrite and only half done).

I'm not going to name names but it rhymes with jQuery UI.

The best I could do was attach a code snipped to a bug report. I've gone back and forth about whether that should count as participation but for that case it's the most calendar time I've ever put into a line of code and you're goddamned right I want to count it.