How many hours in a day is too long to use a digital device? The short answer is whenever, as a parent, you think is too long, but experts generally agree on a few conclusions. Screens should be off limits to children under 2. Although the American Academy of Pediatrics says “entertainment” screen time should be limited to just two hours a day, Common Sense Media quashes fears of zombie children: “The reality is that most families will go through periods of heavy and light media use, but so long as there’s a balance, kids should be just fine.”