It is well-known that subjectively, time flows faster and slower in different situations.
When do you feel that the time flows fast, and when does it slow down? Do you prefer slow time or fast time?
A good friend and I both prefer the slow time, but our understanding of it is the opposite.
For me, time is slow when I have little to do, when, like I put it, "I have time to hear myself think".
And for her, the more she has to do, the "slower" the time flows. (This results in interesting conflicts between our schedules and difficulty to meet, but it's another story.)