I'd taken a couple of days off the app. Didn't plan it. It just happened. When I came back I could feel the difference straight away.
The words I'd learned most recently were slipping. I had to work to pull them up. The words I'd locked in weeks ago came back instantly. No effort.
That gap is useful data. The early vocabulary has had enough passes to settle somewhere solid. The newer words are still close to the surface. Two days off is enough to feel that difference open up.
Consistency isn't just about not forgetting things. It's about how deep the words go.