How much do other BJJ schools preach flexibility?

my old school did about ten minutes but only streching so far..never pushing the boundries..

I cant remember a single time that we stretched in class. I always did before and after. but never did we in class. hence, I dont go there anymore.

Stretching is huge but to include it in a class curriculum is in my opinion is questionable use of time. It'll take away from drilling technique, drills, rolling, etc. I tell my guys to arrive early to stretch before and to stretch after class. I also tell them to stretch for a half and hour at the least at hom.