If so, what kind of things have you found to lead to the most fruitful relationship?

Answer
I do, but sparingly since really getting to know someone and understand their motivations, fears, needs etc. is time consuming like any relationship. I think the most important thing is to develop a connection that comes from true mutual interests and also to recognize when the mentor or mentee is no longer getting enough out of it to continue. I don’t like being a crutch for someone who just keeps going in circles but doesn’t make progress. Those people need a therapist, and I usually have to break it off. All in all mentoring is great, but it is much less formalized than it sounds.
some one is willing to offer mentor roll and spare time to work for them for work of needed in weekends and holidays , no charge , all free for the founders in need and genuine starts ups .