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Temperature and possibly other factors influence egg development. We have seen small egg species go from egg detection to hatching in as little as 10 days (often the begin date is not accurate though). I took a look at Cassy's thread (large egg and longer brood time) since I know when she produced the eggs (Mar 24), when I first found eyes (April 15) and when they hatched (May 12). So, for this set-up and a large egg species 3 weeks. You can expect less time and I would guestimate 2 weeks tops. You can start with the March 24 link above and scroll through some of the pictures to see the egg development but you will not see even that much with the small eggs because of the size difference (yours are a third or less in size). I highly recommend photographing if you can but getting a peak is difficult and disrupting the mother not recommended. Also keep in mind that the eyes are not always visible when they first appear. I am not sure why but definitely noticed that as I looked at the eggs more eyes appeared over a 5 minute period (or so).
This is not uncommon, especially if they brood right away since being reclusive in the initial month is normal. Brooding and about to brood is more detectable if they have been with you awhile. Normal clues are collecting small shells, trying out new dens and eating twice as much as they have been. Unfortunately, most new keepers get excited about the hearty appetite and increased activity. I think part of the reason we often see newly introduce females brood soon after introduction is the increased appetite so they are out more often and easily caught.
I have moved Mo and the entire den upstairs into my 30 gallon tank so the fish wont bother them. The problem is that this tank isn't exactly ready and still needs a month and a half to go so this will be interesting. Mo seems to be doing fine up there she seems to be getting impatient and just blows at the eggs as they swing back and forth. Tell me if this is normal or not. Mo's eggs are on the roof of her den and she clings onto the top of the den covering all the eggs in her mantle. She doesnt really seem to run her arms along them at all, she just blows. I also think that the eggs are fertilized because I see little brown specs on some of the eggs( is this algae or eyes?)