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I agree with approximately an hour. I work with preschool students now and they are restricted to an hour a day. Better Beginnings only allows them to have 30 minutes a week.

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Here is an article I found discussing the use of technology with young children. https://www.naeyc.org/content/technology-and-young-children/preschoolers-and-kindergartners

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Everything I looked up says that it various based upon the ages. 0-5 years should not have more than 1 hour per day.
http://www.cbsnews.com/news/screen-time-for-kids-media-recommendations-american-academy-of-pediatrics/

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I found a video that might give you some answers. It talks about the amount of screen time children of various ages should have.
https://www.youtube.com/watch?v=Q1-DhhF6q40

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In the classroom, I think more than an hour would be far too much. I have attached a video that talks about how much screen time children should be allowed to have. http://www.cnn.com/2015/10/06/health/screen-time-rules-change-pediatricians/index.html

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EDMD3013
How much screen time is too much when using technology in a Kindergarten classroom?