Sorry for the bump, just hoping someone knew the answer.

As usual, she was waiting for me to feed her, and since I bought a second culture last night to be able to alternate and allow them to produce more between feedings because she was emptying it quicker than I wanted and the second one was so overrun with flies having sat on the shelf for however long I gave her a generous amount (I'd say around 60) and she gobbled them up in no time.