George has about 350 boarders, and it’s made clear to even those who are local that the expectation is that they should be part of the community (so not leaving every weekend. ) Many day students tend to stay on campus well into the evening and are there on weekends as well. So there is a pretty vibrant 24/7 life.
There are smaller schools that are 100% boarding and have the same # of boarders. I would not rule out a school without visiting on that basis.