How long does it take for a zebra finch egg to hatch?

my birds had 5 eggs at diffrent times/days. i just want to no how many days they take to hatch cause some say 12 others 25 which? without the incubator with the mom and dad zebra finch just siting on them

14-20 days.
One will hatch a day…
If they’re fertile.
Mine hatched late though.
(:

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