I'm sure that the guidelines above are well intentioned and would be helpful. However, trying to enforce them would quite possibly lead to the parents being institutionalized. {snark}
If you tried to tell my 7 yo grandson to turn off his 'screen' after 1-2 hours, the rest of the day would be spent in a screaming meltdown. We can't even get him to come to the table for meals. He would rather raid the kitchen for whatever strikes him at the moment, and woe unto us if we don't happen to have the 'whatever' available. I clearly remember an evening a few weeks ago when he decided he wanted some grapes. We didn't have any. Battle royal between father and son, with son demanding that father go to the store (RIGHT NOW) and get some grapes. Or the screaming, door slamming, shoe throwing episode when the cable went out for a couple of hours and he couldn't play his game on-line.
I know that our son loves our grandson and tries very, very hard to be a good father. He has the patience of a saint, works with the doctors and the school to try and provide the best atmosphere for his son. But trying to adhere to the above guidelines would give us all a nervous breakdown, no matter how 'good' the recommendations are.