That really just depends on the scale they are personally used to though, for a fair few years I lived ~5 hours from my family (relatively far within the country), but it didn't feel like very much because I/we visited my partner's family on the other side of the continent at least once a year. Prior to that, I don't think that I would have visited anywhere near as frequently.

The lack of Schengen and now EU membership may make British people more prone to being on the smaller side of this.