I would venture a guess that it is probably more like 90%
did they switch ten minute to rapid?

I would venture a guess that it is probably more like 90%
Actually it would be reasonable, since I also studied common middlegame plans for both sides, so that I could be flexible in my games and not get lost in the middlegame wasting time to decide on a plan.

Other than 10|0 this should be correct.
https://support.chess.com/article/330-why-are-there-different-ratings-in-live-chess
Interesting, I'd contribute studying openings for about 70% of my rating increase.