# Nursery operation
> ### The nursery allows the sale of eggs
The eggs are sold in a specific order:
* 5 bronze sales unlock 1 silver sale,
* 5 silver unlock 1 gold,
* 5 gold unlock 1 platinum.
This mechanism allows for sales by nursery:
* 5 bronze eggs per day
* 1 silver egg per day if the 5 bronze eggs are sold
* 1 gold egg every 5 days
* 1 platinum egg every 25 days
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These metrics take into account the sale of one egg every hour.
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The eggs have a hatching time depending on their type:
* Bronze: 1 day
* Silver: 3 days
* Gold: 7 days
* Platinum: 14 days
The impatient can hatch their eggs early by burning BZAI (10 BZAI per hour earned).
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These metrics can be changed by vote of the DAO\* in order to balance the game.
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| Egg type | No. of eggs | Production in days | Hatching duration in days |
|---|
| Bronze | 5 | 1 | 1 |
| Silver | 1 | 1 | 3 |
| Gold | 1 | 5 | 7 |
| Platinum | 1 | 25 | 14 |