How long does it take a bird egg to hatch?

Birds such as a African Grey Parrot, Macaw, and Quaker. Or just any in general.. Not only how long it takes to hatch but also how long it takes for a bird to lay an egg. Thanks!

i have a pair of breeder cockatiels and it takes a cockatiel egg 17-21 days to hatch

Eclectus parrots have an incubation period of 26 - 28 days, from what I can remember this is the same as Afriacn Greys. Once the egg is fully formed it does't (shouldn't) take long to lay. If the bird goes to the bottom of the cage, looks sick and has swelling under the tail, the bird could be egg bound. Finches incubation period is around 14 days. It depends on the species as to the incubation period.

Usually 21 days depending on the temp of the room air. A bird will lay eggs 10 days after she first breeds.