Imagine, if you will, being in an interstellar relativistic travel group. You have split up for a couple of decades to explore different corners of the local group. You all arrive at the destination system roughly on schedule (give or take a few weeks). Well all, except fucking Kevin who somehow managed to take a wrong turn probably, who knows, because the genius also forgot to refill entangled particles for communication before undocking! Have fun waiting for Kevin for like another 20 years.