It depends on how fast they are travelling. I've broken out some target velocities for the kids:
If they walk: 4,976 days
If they run: 663 days
If they drive: 153 days
If they hitch a ride on the space shuttle: 13.5 hours
If they morph into a photon: 1.2 seconds
Good luck! And make sure they pack a sweater!
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