Do you have data how long Price/PeakBV per share was in each bucket

No, the widths of the buckets aren't bell curve shaped...
It isn't divided into equal intervals of P/peakB, but equal by number of days.
(that's why the P/B values near the middle of hte table are so close together: there were lots of days near those values)

Each bucket was 1/20th of the purchase dates since the start of January 2003.
Since the return observations were a year forward, the last start date was about a year ago.
So, the start date range was 2003-01-02 through 2021-11-16, which is 18.87 years of start dates.
Divide by 20, and each bucket is the average return across 0.94 years (11.3 months) of start dates with similar starting price-to-peak-book values.

The individual purchase dates aren't independent observations, of course.

Jim

Berkshire Hathaway FAQ

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