What your chart shows is the floor after each peak is established 214 days after the previous peak. That would make the current price the floor for the next bubble burst. But that assumes the days between bubbles is always constant. I don't think anyone ever took that seriously. It's just a coincidence.
My chart shows time between peaks, like the OP's guess.
Not the "establishing floor", just time between peaks.
Look at your chart again. The time between peaks is what you
wanted to show. But a picture is worth a thousand words, and this speaks more than you anticipated.