This is an age old question.
My parents used to worry about me watching the TV,
limited me to two hours a day during school weeks.
Ah, it's just one of the things that occurs.
You have to realize that screen time is different
depending on what activity you are doing.
Screen time just watching a video is a bit
like watching a TV.
It's pretty inactive.
Screen time actually playing a game
or doing anything (laughs) other than just
plain watching a video is more acceptable.
It's not that much different from playing inside anything.
So if your children are already physically active,
you should consider limiting the amount of videos
to not too much but not otherwise restricting screen time.
The exception, of course, is that screen time,
like any sort of play activity,
can hype kids up before going to bed.
So it's probably best to leave these things aside
an hour before bed and instead have a book
or have some sort of quiet settling down time.