How long to leave the eggs in the cage if they don't have a baby in them?

If the eggs in the cage are unfertilized and do not have a developing embryo, they typically won't hatch. Depending on the species, you can generally leave them for a few days to a week to ensure they are indeed unfertilized. After that, it's advisable to remove them to prevent any potential bacterial growth or odor. Always check for specific guidelines related to the species in question for best practices.