How to get cockatiels to notice a nest box and how long will it take them to breed?

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I bought a breeding pair of cockatiels yesterday and want to know the estimated time it will take them to breed. Also how can I get them to notice the nest box? There's treats above it and the male sits on the treats and the female sits ontop of the box and eats fallen peices of treat. What's a good way to get them to go inside the nest box?

Answer: 
Give them time. When they want to breed they will. If you got them yesterday they are probably wondering where the hell they are. It will take bout 3 weeks for them to have sexual intercourse. Just give then time.