I truly don't understand why this isn't more widely discussed (I've seen several "GH Actions Gotchas" articles where this isn't mentioned). Many of the community actions also seem to be designed to run as short jobs to paper around missing features (for ex: https://github.com/dorny/paths-filter ), that end up eating up an enormous amount of your minutes budget.
So if you have 5 10 second actions that run when a PR is created, that 50 seconds of compute is charged as 5 minutes.