How long does it take for an egg to hatch? We have a pair of breeding Bourkes and the female has sat on an egg before for a few weeks but the egg was broken and dead so we removed it, now she has laid another one we are wondering how long it will take? We are concerned about her being obsessed with sitting on the egg and getting a cyst on her chest which has happened to one of our budgies. Can you advise how to prevent this. Thanks.