Round 7

I have gotten a bit behind on the 2016 Spring Doily Tat along. Round 7 is now complete. Round 10 has been given out, with more to follow.  These 7 rounds measure 8.5 inches across. I wonder how big the finished doily will be. I'm using size 30 thread. In size 20 it would be a little bit bigger. It would be huge in size 10.