I think you're right, although, I don't think they got 20k submissions. I heard or read in an interview that after the two week mark, they were still getting "about 100 a day". I think it's more in the ballpark of 12,000 or so, but either way, after making 12k quick decisions after listening for 3 seconds, they actually have to go back and really listen to 200, which could take a lot of time.