clock-watcher
One who often checks the time during an activity or event, as due to boredom and/or a desire to leave. He's a total clock-watcher, so I doubt that he likes his job.
clock-watcher
someone -- a worker or a student -- who is always looking at the clock, anticipating when something will be over. There are four clock-watchers in our office. People who don't like their jobs can turn into clockwatchers.
clock watcher
n. someone—a worker or a student—who is always looking at the clock. People who don’t like their jobs can turn into clock watchers.