Bird eggs take varying amounts of time to hatch depending on the species, size, and incubation conditions. Generally:

• Small songbirds typically incubate their eggs for about 10 to 14 days before hatching

• Medium-sized birds like woodpeckers and pigeons take around 12 to 18 days

• Waterfowl such as ducks and chickens usually require about 21 to 28 days

• Larger birds, including raptors like eagles and hawks, may incubate eggs for 30 to 50 days or more

• Very large seabirds such as albatrosses can have incubation periods up to 80 days or more

The incubation period starts when the parent begins to keep the eggs warm, often by sitting on them, and ends when the chick hatches. Some species begin incubation after laying the first egg, causing eggs to hatch sequentially, while others start after the last egg is laid so all hatch simultaneously

. In summary, the incubation (hatching) time ranges approximately from 10 days in small birds to up to 80 days in very large birds, with most species falling somewhere in between based on their size and biology