This is an excellent question, Robert, and is one of the main source of edges when trading with pivots.
All I have as an objective resource is an old confidential study that was performed by a statistician at my request 15 years ago for the investment bank I was working for.
In his conclusions, the statistician stressed that the levels were much distributed along a normal distribution curve on each timeframe, similar to a standard deviation structure.
50% of the time, the maximum moves are within R1 and S1.
66% of the time, the maximum moves are within R2 and S2,
95% of the time, the maximum moves are within R3 and S3.
I am confident that an update wouldn't change much the observations.
You can easily check - as I mentioned from time to time - that QQQ experienced its weekly lows at WS3 on the strongest down weeks this year. It marked a reversal for at least a few days each time.
MS3 could provide a reversal area for 2 or more weeks. (You need to adjust QQQ for yesterday's dividend).
Billy