I think it depends on whether or not you want to go through the engorgement process. When I was down to about two feedings, I weaned in about a week with no engorgement pain. Since you are down to two feedings, I don't think it would take you long to just wean and not go through engorgement. This is what I did: I would cut the afternoon feeding to 1/2 the time for the next few days, to see if you get full sooner than when he has a full feeding. Then, cut out the afternoon feeding altogether. I would then do the same with the night feeding. I thought my daughter was really attached to this feeding, but she dropped it easily. When I was weaning this feeding, I would go about 1/2 the time, make sure I kept her awake so she knew I was leaving and my husband would top her off. I did that for two or three nights. Then I just stopped and it seemed to just take care of itself. I only have one baby right now, so maybe I was just lucky.
Good luck!!!