M.M.
At 12 mos I had DS strictly on adult food, so I would give him his milk in a sippy 2x/day. Usually first thing in the morning, and then with dinner. So 16oz. (Or doc recommends 16-24oz/day, and DS is perfectly happy with water through the day.)
So by that point, I had him off of the concept of bottles and timing those throughout the day. We were doing regular snacks between meals instead.