15 month old DD is exhausting me. About a week and a half ago her nice, short 20-mins-max night time feeds turned into 1-2 hour marathons. I've been waiting for the "phase" to end but not sure it will.

A friend warned me that the same thing happened to her when her milk started to dry up. I know mines been getting less and less cause my boobs never feel full anymore, but what do I do to stop this? I'm lucky if she stays on for 5 minutes during the day. Should I be trying to move her onto cows milk for daytime now? She drinks it when I'm at work so I know she'll take it. If so, how many cows milk feeds and how many breast milk feeds and when? Ta