Proving that my vocab is not as expansive as I would like, I did manage to attain the dizzying heights of 40 (several times) and in the process was responsible for donating 1,340 grains of rice. It goes without saying that serious word people, were comfortably in the 40s and regularly attaining a score of 50.
Update: with a bit of practice you can improve. Some words repeat but not enough to explain the improvement. I’m now scoring primarily in the early 40s and briefly made it to 44.