If you're using the main repo for PDS then you probably have the one that doesn't pause fro 5 secs between API calls (Reddit's limit). The first fork version has the pause and works correctly, though slowly. Just be aware that there's a bug in PDS that stops adding to the exported file if it hits an error (If you have 100 comments and get an error on comment #15 it will continue to edit/delete, but the exported file will only have 14 comments.)