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It depends what animal it is.
18-21 days
Maybe 24 hours
30 days
yes they lay it right after mating
how long do the flies they live in your house
How long do house flies live
After mating, it takes approximately 2 months for the eggs to be laid, and then another 2 months for the eggs to hatch.
Maybe a couple of days. When it is ready the shell cracks a little bit everyday :)
House flies have a powerful sense of smell, enabling them to detect sources of food--such as your garbage--from long distances. Once a fly gets into your house, it lays eggs on the garbage or other source of food. When the eggs hatch soon thereafter, you have instant flies all over the place.
3weeks
They can get maggots if you leave their dog food out too long in the summer. Flies can get in your house and lay eggs in you dog`s dog food the larvae ffeed on the dog food.