I would say any where from day 3 to day 7-8 if nothing by then I would throw them out unless there is a large black spot in it mine were like that and then about day 12 I could see something in them moving I was going to throw them out
Yes my first hatch I had kept the baby's in an old Guinea pig cage that is to small for them so I thought I would use that and about the first 3 days they just chirped and chirped I thought I was loosing my mine no matter where I went I could still hear them chirping