I've read two hours per drink.
but sometimes it can surprise you. i had one beer and 1/2 glass on wine over the course of 3 or 4 hours last month and i blew .08 which is way too much for baby!
But if it is out of your blood it is out of your milk.
I sometimes use a breathalizer. I think every home should have one, because alot of poeple really do not have accurate ideas about how alcohol effects them. i think they are about 70, 80 bucks. ours was left over from party days way before baby. so our guests could check them selves before going home. and my guests were very often Surprised!
You can also buy strips to test ur breast milk at Target. about 10 bucks for 9 or 10 strips.
From the testing i've done, one beer regestered under .02 (which is almost Nothing) and a Small glass of wine would probably be close to that.
and it takes about 30 minutes for that to get into your breast milk.
I don't know if you are pumping at all, but i have slowly worked up a supply for my freezer in case of emergencies and maybe an occasional date with hubby. and if i want to have a couple glasses of wine, then we use my frozen breastmilk for a feeding, and them i'm fine again by the next feeding.
Just remember, pumping and dumping doesnt work. If you still have alcohol in your blood, it will still be in what ever milk you produce.
on the up side. what ever milk is in your breast while your drinking will be good again as soon as your body works the alcohol out of your blood.