Why can't we slow down time? Like... not literally slow it down, but slow down the perception of time.

When I first started taking adderall I felt as if time slowed down and stop flying by. Maybe this was because of stress and some lack of sleep.

However, when I went to work on the weekends, I missed my coworkers, it felt as if I didn't see them in ages. However, the amount of things I did was insane. Time literally slowed.

How can I do this again?