How large is Black Plum

[Greatgardens]

Looking at the internet descriptions and Youtube, the sizes run all over the place. I've seen up to 4" long, but more commonly (including TomBase) it's more like 1-1/2 - 2" by 1" (or so). The youtube video that I found had them growing in a 5-gal. bucket and they appeared to be maybe a bit over an inch long. Some insightful descriptions just say "small."

Surely someone here has grown them. Could you share your results?

-GG