How long is NICU time for low blood sugar?

My baby was admitted to NICU for low blood sugar. She started with great numbers. All of a sudden they were dropping but I assume it has something to do with me not pumping out enough breast milk for her so they are supplementing her with formula. Her numbers have approved. They wanted to aim for above 45 bc she was at 39 before being admitted. She’s now at 106 and last check was 81. I asked the nurse how long it might be until she’s okay to take home and was told 2-3 but I’m wondering if she’ll leave earlier being that her numbers are better. Has anyone had this experience?