I weigh 175 and just tried and made it to 30 but that's after a heavy workout that left my upper body completely sore. I can probably reach aroung 50 on a good day.
What I usually do is 3 sets of 30 and then add an extra 10. That's 100 right before bed.
http://www.youtube.com/watch?v=F1gWECYYOSo
Please Watch/Share this video so it gets shown in Hollywood.