I've found that it takes about 10-ish stumbles to start taking off, and if I hit 20, I'm likely going to hit 50+ (I have yet to find a way to figure out how many stumbles you've gotten over 50).
Speaking of which, here's my latest article, for those who are interested:
Being A Dad You Can Count On - 7 Pillars Of Fatherhood
I had one hit the popular page on SU a couple days ago... it'd be really cool if I could do it twice in one week!
By the way, anyone who has Reddit and wants to vote for this article, your help is greatly appreciated.