Tapping into my freezer stash

Kira • Wife 👰 Engineer 👷‍♀️ Mommy 🤱 9/8/16 💖 5/21/19 💙
I go back to work this Thursday (boo 😔) My mother and husband will be using my milk i started storing in the freezer from mid-Sept. My Sept and Oct bags are stored in 3oz portions and Nov and Dec are in 6oz portions. 
I would appreciate any suggestions on safe defrosting and using my freezer milk most effectively without wasting! 
They are stored in the Madela and Lanoosh plastic bags. My biggest question is should I just put a few bags from the freezer into the fridge the night before to thaw out for the next day? Or defrost bags from the freezer on a feeding by feeding basis? 
We boob feed 99% of the time so it's hard for me to tell what she will need when I'm gone. When she has had a bottle this past month she has about 5oz. She will eat every 2-3 hours, sometimes sooner but she will drink less. I'll be gone for 10 hours so I'm thinking 25oz a day when I'm gone to be safe. Is that excessive? 

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