Is it a constant round of social events and outings or does life carry on a usual, the only difference being you're staying in their house?
I suspect for most it's somewhere in between, but teens are increasing complaining that they're "bored". What do they do, which isn't constant phone use and sure to get them told off by GF when staying away from home?
I've been a bit vague because it's not actually me but someone else complaining about how difficult visits home are for her teens. We had the same situation when I was a child and TBH I can't remember what we did to pass the time, I wondered what I could suggest.