About 15 days.
well if you have a barn swallow egg get a nest with feathers and put it in the sun make shore nothing gets to it.
Barn swallow eggs typically hatch in about 14-16 days after they are laid. The incubation period is primarily carried out by the female barn swallow.
Barn owl eggs take 31-32 days to hatch.
Until the egg hatches.
17 days for an egg to hatch out
The golden egg is in the barn
Three years.
8 months
A Barn owl egg typically measures around 45-50 mm in length.
To hatch a barn swallow egg, you'll need to mimic the natural conditions of a nest. Ensure the eggs are kept in a warm and stable environment, ideally around 98.6°F (37°C), as barn swallow eggs require consistent warmth to develop. It's important to maintain humidity levels and avoid disturbing the eggs too much. In the wild, the parent swallows will incubate the eggs, so if you're attempting to do this artificially, be prepared to provide constant care and attention.
3 years
they stay in there egg for 3-5 days