Most tiels lay 4 - 5 eggs per clutch, if the don't sit on the eggs you can toss them in like 30 - 33 days, if you remove them earlier she might lay more. Laying is rough on your females , make your you have a cuttle bone and a mineral block for her.
http://adf.ly/m0AGF heres a link to a site with information about that . just skip the ad and it will redirect you. hope this helps :)
My cockateil laid 2 eggs and I have a male and female cockateil, this has never happened in the year that I've had them and I don't know what to do, the eggs are just sitting at the bottom of the cage and there is no vet in town that sees birds, what should I do?