If you have a spare 15 minutes, have a read through this thread: http://www.fishforum.com/viewtopic.php?t=6280
it's my sort of documentary on when my cories spawned, and how I raised the babies.
To answer the questions you asked however, it does sound like they are cory eggs, but remember that they can lay eggs without them being fertalised. If they're not fertalised, they will turn white after a day or 2 and you should remove them.
Mine hatched in approx 3-4 days, but I too have heard that it can take longer.
The fry are not difficult to raise, but they can be delicate so water quality is of HUGE importance. Feed baby brine shrimp, egg yolk mixture and after a few days try some crushed flakes as well.
The breeding nt should be alright for them for a while, but not long term. Ideally yo'll have them out of there ASAP but for a week it will be OK. Make sure when you do move them that the water they are in is top quality and DEFINTELY 100% fully cycled.
Anymore questions just ask. :)