Most of the time I talk about 70-80%. I'm usually telling him stuff, like what's going on in my life, or a dream. Then he'll respond with an opinion, or ask questions, etc. He likes to pontificate sometimes, and go into teacher mode (he's also a post-graduate psych prof) but that doesn't happen too often. It's usually pretty balanced - I don't feel like either one of us is talking too much or too little.

As for silence = almost zero