I think young children should spend no longer than an hour a day using screens. As far as adults go, I think it would be healthier if we spent no more than two or three hours a day, but I know that’s almost impossible given work often requires the use of phones, tablets, etc.
I have to take lots of breaks from the screen during the day due to eye fatigue and sometimes slight headaches. I don’t think it’s good for the shoulders and neck looking at a phone screen for hours a day either!
You’re very welcome

Thank you for your response