Some people take them once a year, others only when they need it. Unlike dogs and cats and some other animals, they don't get vaccinations, so there's no need for a trip for those.
Mine have never been. The only exotic vet within 100 miles won't see rabbits and guinea pigs because he's severely allergic. If I ever notice symptoms of illness we'll have to go for quite a drive, but until then I don't think it's worth the stress.