My OB said that if I time it perfectly, I can enjoy a glass of wine in the evening without having to pump and dump, which I suppose is true if I put LO down at 6:30pm and she doesn't wake for a feeding for 6-7 hours.

But what about a night of heavy drinking? I will be attending a function and I plan to drink - not crazy heavily but enough for me to HAVE to pump and dump.

How much do I have to pump and dump to cover a night of drinking?