Those times seem like either Zulu time airings (meaning a universal time standard that's used around the world over the local time zones) or it's the run lengths of the episodes. It would be likely that, back in the late 1980s, a runtime of 22m 15s is likely, as today, syndicated shows clock in at around 15m to 18m today. Network shows, which clock in at 21m 30s today, were also longer back in the 1980s.