I spent more time than that around that age and everything was fine. Not saying it's always fine but more context would give you better answers here.
What games are they playing? Anything competitively? What anime are they watching? Do they talk to friends / discuss them online? Do they get excited by it?
Your friend could try to engage with them around their kids interests instead of taking them away and forcing other things that may not be of any interest and just stress their relationship.
Maybe it was a lot but I turned out fine... in my case I was playing DotA / TF2 competitively at the time and so I learned a lot of transferable skills (that come to anyone that competes at a reasonable level), even though "I was in front of the computer for a long time", which is exactly how my parents would have described it.
I watched movies and anime a lot in "front of the computer" but I had communities online to discuss them and engaged with them deeply (i.e. not just a mindless activity). Here I was lucky that I had friends to talk to / watch with.
It all depends really and I would push back to understand if their child's time on the computer is actually wasted.
Also, 18 year old isn't really a teen anymore... basically an adult!
For the record I don't spend that much time these days but my interests just sort of shifted as I grew older naturally to other things, but the way the post is phrased just makes me wonder if it's actually a bad thing...
What games are they playing? Anything competitively? What anime are they watching? Do they talk to friends / discuss them online? Do they get excited by it?
Your friend could try to engage with them around their kids interests instead of taking them away and forcing other things that may not be of any interest and just stress their relationship.
Maybe it was a lot but I turned out fine... in my case I was playing DotA / TF2 competitively at the time and so I learned a lot of transferable skills (that come to anyone that competes at a reasonable level), even though "I was in front of the computer for a long time", which is exactly how my parents would have described it.
I watched movies and anime a lot in "front of the computer" but I had communities online to discuss them and engaged with them deeply (i.e. not just a mindless activity). Here I was lucky that I had friends to talk to / watch with.
It all depends really and I would push back to understand if their child's time on the computer is actually wasted.
Also, 18 year old isn't really a teen anymore... basically an adult!
For the record I don't spend that much time these days but my interests just sort of shifted as I grew older naturally to other things, but the way the post is phrased just makes me wonder if it's actually a bad thing...