What is a 1-2-1

I'm on the membership committee of my group. We are getting conflicting definitions of a 1-2-1 from our chapter coach and the regional director. The coach says they need to be at least an hour long, intentionally set in advance, and ideally at least 90 minutes. The director is saying that a conversation in the parking lot that isn't concerning a referral and that touches on our individual businesses is enough. Obviously they can't both be right and i don't know how to direct my members. Is there a written, technical, official definition somewhere that i can refer to or is it really just a know it when you see it kind of thing?