TenTigers is right on.
At the school I was at for the longest (11 years) we would lose them within 3 months, then at blue sash - things got harder then, also about 2 years and then there was what we called 'black sash burnout' that happened right after someone would get their first black sash around the 5 year mark.
10% of 10% of 10% is what I always say. only 1 in 10 will get past the first couple of months; 1 in 10 past 2 years and 1 in 10 past 5.
"George never did wake up. And, even all that talking didn't make death any easier...at least not for us. Maybe, in the end, all you can really hope for is that your last thought is a nice one...even if it's just about the taste of a nice cold beer."
"If you find the right balance between desperation and fear you can make people believe anything"
"Is enlightenment even possible? Or, did I drive by it like a missed exit?"
It's simpler than you think.
I could be completely wrong"