Just wanted to say that the guidelines for EBM in fridge is 24 hours, there are lots of different storage containers out there to make freezing smaller quantities quite easy though.
Breast feeding network say longer...
https://www.breastfeedingnetwork.org.uk/pdfs/BFNExpressing&Storing.pdf
Yep. You can store breast milk at room temperature for 24 hours and, according to some sources, up to 8 days in the fridge.
Well when my babies were in scbu, in all four hospitals we were in ebm was thrown away if kept in fridge for more than 24 hours. So I personally wouldn't trust it for longer.