I didn't really have a specific plan. I was doing 4X a week at more than 18 months postop until just recently; I had tried skipping a day, it went fine, so I went to every other day. Then I tried skipping two days, no problem, went to every third day.
Then I, um, got confused on the new rotation and forgot an extra day. Found out waiting 3 days between was no trouble, and now I'm at twice a week. Not sure how I'll wean down from here, but 15 minutes twice a week is easy anyway. At this point I rather enjoy it.
If you miss a day before you're ready, you'll feel it next time you dilate.