I did about 400+ over three days. It took about 3 to 4 days for them to approve, but they approved every one. (Whew, too 'cause I only had about 480 total approved HITS when I started. I found there were quite a few, that didn't make sense at all. Those, you are supposed to check "I don't understand" or something like that (It's in the instructions). But if you check something else first and then try to check "I don't understand", sometimes the program would get stuck and leave two choices checked. I don't think I'm giving out anything, that would affect the outcome. I'm just giving a head's-up so if it happens to you, you won't think you broke it like I thought.