Way to go, Anne. The last one I got from our garden was about that size. Just about a nice serving for my dh and me.
I think they must water them like crazy to get them to the size we see in the grocery store. I did have a bigger one at our other house a few years ago, but the raccoons got to it the day before I was going to cut it. What a lesson after waiting 2yr. for a plant to produce fruit! I've been battling raccoons ever since.