Alcohol and breastfeeding/pumping

Tonight I'm going out to dinner with a few girlfriends, and we plan on having a drink or two. I'm going to feed LO before I go, and we have saved pump milk for while I'm gone/after. I thought I read that when you get back from drinking, you can pump, and the alcohol will leave the milk in due time? How long should I wait to give her that pumped milk and how long until I can breastfeed again? I'm looking for any advice that y'all have heard. Thanks!