Here's a general guideline:
* Kittens can go for a few hours without food, but they need water every few hours. Dehydration can be very dangerous for them.
* Without food and water, a kitten could start to show signs of distress within 12-24 hours.
* Longer than 24 hours without food and water can be fatal for a kitten.
Important factors:
* Age: Very young kittens (under 4 weeks) are especially vulnerable and can dehydrate quickly.
* Health: Sick kittens or those with underlying conditions are at higher risk.
* Temperature: Hot weather can accelerate dehydration.
If you have a kitten who is not eating or drinking, please contact a veterinarian immediately. They can assess the kitten's condition and provide the necessary care.