I would wait for one week and then kindly would ask in the PR when they would have time to take a look at it. But, before you submit a PR, you should take a look at how active the project still is. When there is not a lot of action, then think twice before submitting a PR.
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What are your tips for when you submit a pull request, and it sits there for a long time until (if you are lucky) a maintainer looks at it?
I would wait for one week and then kindly would ask in the PR when they would have time to take a look at it. But, before you submit a PR, you should take a look at how active the project still is. When there is not a lot of action, then think twice before submitting a PR.