Humans have no knowledge or experience of aliens hatching and so there is nothing on which to base an answer.
About an hour.
Young robins are fledged and flying poorly by about 18 days after hatching. They are able to fend for themselves after about six weeks.
Hatching occurs after about 4 days.
No but it doesn't take long, usually
how long does it take to grow a new layer of skin
how long does it take for a baby carp to grow full size
they take about 5 days to grow.
365days to grow corinander
grow what dont understand
Sometimes it takes a few hours and sometimes up to a day.
Ducklings typically learn how to fly within 2 to 3 months after hatching.