I board my horses at my neighbors house, literally a 5 minute walk (If I'm only strolling) from my front door to my horses stall door, but it is self-care. I work at a barn that is 15 minutes (20 if I get caught by the lights and I actually go the speed limit) away. Honestly, I wouldn't want to board much farther away than this. Its a pain in the winter, and could be even worse if there was an emergency-a lot can happen in 15 minutes. It also depends on the barn though. I live out in the country, the barn I work at is still the closest decent barn around, and I would trust them with my horses-definetly worth the drive. It would be better than a barn that would be risky for my horses yet 5 minutes away.
Eventing: the only sport where you wear your medical information strapped to your arm.