Just a few days. It’s done by running an external service that joins rooms and listens for commands. We’re using maubot [1] since it’s one of the more popular ones, but it has some rough edges [2] [3] [4]. Our setup for just the “rss” plugin is dockerized and documented here [5].

[1]: https://github.com/maubot/maubot#readme

[2]: https://github.com/maubot/maubot/issues/110

[3]: https://github.com/maubot/maubot/pull/147#issuecomment-99722...

[4]: https://github.com/maubot/rss/pull/35

[5]: https://github.com/SeaGL/matrix-feed-notifications