I travel a few times each year for anywhere from 1-7 days. A friend is nice enough to come to my place to take care of my guys if it's under 3 days, but more than that and I'll take them to my parents' house so that my friend doesn't have to travel. My parents love the cuteness, but are deathly afraid to let them out and won't fully clean the cage (only spot clean), so I have to keep my travel time to under a week.
They're fine when they stay home, but they sleep a lot when I pick them up from my parents' house. My dad works from home and checks on them pretty frequently. He said they never sleep... or at least he never sees them fully asleep, and someone is always running on a wheel. I get a lot of the stink eye when I return, but they warm up pretty quickly once they realize they're going home.