This is true for me, ymmv.
Time seems to pass much more quickly as one is experiencing it when one is busy.
However, looking backwards, time periods that were chock-full of activities tend to lengthen. A point in time a year ago seems further in the past in a busy year than a sparse year. Almost as if your mind assumes some average activity density, then applies this to remembered activities to estimate time passage.
I would add that when not busy a sense of panic sets it that only subsides when busy again.. I consider the panic to be the result of one's time on Earth slipping uselessly by.