What do I do if I listen to a stage less than another one?

[Benjamin]

Well then that makes it sound like you have stopped listening alltogether. Depends how long for.

From the manual -

And what happens if for some reason you don’t or can’t use it consistently? Missing less than a week, add that much time to the end of the 32 days you would normally have used it. Missing more than a week, but less than 32 days, you’ll have to start over with the volume you have been missing exposure to. If you get to more than 32 days without exposure at all, you should start over from the beginning.

So you can add it if needed.