Birds generally leave the nest (fledge) between about 8 to 30 days after hatching, but the exact timing varies greatly depending on the species.

• Most small songbirds leave the nest at around 14 to 30 days old.
• Some species, like Baltimore orioles and bluebirds, typically fledge between 2 and 3 weeks old.
• Precocial birds, such as ducks, plovers, and quail, leave the nest within hours to days after hatching as they are able to walk and feed themselves almost immediately.
• Raptors may stay in the nest much longer, sometimes 8 to 10 weeks before fledging.
• Young birds often leave the nest before they can fully fly and are then fed and protected by their parents outside the nest for some time.

Fledging is often a cautious, gradual process involving encouragement from the parents, and the young birds remain vulnerable until they develop stronger flight skills and independence. In summary, the typical bird leaves the nest about 2 to 3 weeks after hatching, though this can range significantly with species and environmental conditions.