A Parakeet can not go for more than 24 hours without food before becoming ill or dying as a result of no food.
Parakeets must eat daily and within 24 hours before they become ill and possibly fall over dead.
A Parakeet also has a very active metabolism and much more active than a humans metabolism which means that they must have some food in their bodies daily or they get ill really quick.
Sometimes a Parakeet may live for 2 to 3 days before dying without eating or the Parakeet might die within the 24 hours.
Make sure to keep plenty of food and water out for your Parakeet so they can eat and drink water when they need to.
A Parakeet will eat when it needs to and gets hungry and they will drink water when they get thirsty.