Sometimes it can be longer, over a couple of days.

If you notice her having problems swimming, or eating, or something out of the ordinary, there could be something wrong, but it's rare.

If this is her first litter, 6 fry are a good first batch. If she's had larger litters that you know of, she may not be finished yet.

She will still look pregnant because she still has babies to deliver to you in about a month from now.