Yes, that's true. I've been looking into it, and it's the next thing to be fixed.The problem is the template: the log is full of errors like
Code:[2025-05-27 14:18:24] Error: Unable to find track that fits criteria (rule: norepeat-artist). Category: "Media (No Lento, No Triste)"
Because of this, it will take a lot of time to create a playlist, and also the resulting playlist will not be correct as when it's unable to find a track, it will skip the category.
You should adjust the repeat protection rules - general or for categories that have problems. You should ensure there are no errors when creating a playlist.
But RB should be quick to resolve this. About 3 hours to generate a 1-hour playlist is excessive.