It used to stay the same when going over 100% - 86' (almost 30 yards). I was messing around at Prison Putt and came to a long one. Not thinking it would make any difference I "max putted" 122% on the meter and it went WAY past. So went to practice green and found out half max about 46Y and full max 65Y!! That's 195'!! That's when you take out a wedge and make a dent in the green (obviously one wouldn't putt off green).
Anyway don't know how long it's been that way (never run into putts over 86') but just a heads up in case you land on a BIG green.