That's about right. Against the Pacers they played about 2 minutes in the first half, 2 minutes again in the 3rd quarter maybe, and IIRC they closed the last 4:29 of the game. I would have said 7-8 minutes, but it might be 9 like Locke said.
As for it not showing on 82games, I wondered about this during that game. If Burks checks in for Jefferson do they record him as the SF, since Hayward starts at SG? In another situation Burks could be the SG and Hayward the SF. With only 9 minutes played together they could have part of it recorded as Burke-Burks-Hayward-Favors-Kanter and part as Burke-Hayward-Burks-Favors-Kanter.
Come to think of it the same situation could exist with Kanter and Favors. I'm just not sure how 82games deals with that.