Finch eggs typically take about 12 to 16 days to hatch after incubation begins, though this can vary slightly depending on the species. Incubation usually starts after the hen lays the third or fourth egg, or sometimes after all eggs are laid. Both the male and female finch often share incubation duties, with the female usually incubating at night and the male during the day. During incubation, the parents turn the eggs periodically and maintain humidity by bathing and settling back on the nest with warm, damp feathers
. For example, zebra finch eggs generally require 13 to 18 days of incubation, while house finch eggs hatch in about 13 to 14 days
. Society finch eggs also hatch within 12 to 16 days from the start of incubation
. In summary, finch eggs hatch roughly within 12 to 16 days after incubation begins, with some variation by species and incubation timing.
