This usually speeds up the clock so that your perception is that time is moving slowly. Baseball catchers report this effect when there is a runner on first trying to steal second base. The pitched ball can seem to take forever to reach the plate. Everything seems to go in slow motion. Use of drugs.
Old folks experience a perception that time is passing rather quickly.
One can even measure this. When young people are asked to guage the passage of 3 minutes, a fairly accurate 3 minute is assessed. The difference is even more striking when the participants are required to assess the time interval while they are performaing a task. The summary is below. The values in the table show how the average group performed.