One of the things I always wondered was how did people tell time in Star Trek? I know there was a chronometer at the helm/navigation console on the Enterprise but how did individuals tell time? For example, if landing parties were supposed to report in every hour, how did they know when an hour went by? Or when the villain of the week gave Kirk "2 hours to comply or you will be destroyed." Did they have timepieces implanted in their head? I think ST:VI finally put a clock on the bridge but I always wondered why nobody ever wore a watch.