budgie laid eggs - not eating much

by Peace
(India)

Budgies

I have 2 budgies, they are with me from 3 years. Have laid 2 eggs and is trying to hatch them, but the female hardly eats or drinks anything. it scares me as she might starve. How many days would it take to hatch the eggs, as i don't have the required info as i was not interested in breeding them.