How fast time passes seems to be based on your perspective. If your happy then presto the days goes by smoothly and quickly. If you are sad then things tend to drag on and on.

Also those who are happy tend to over estimate how much time has passed and those who are depressed seem to have a better control on time that has passed.

Researchers in England and Ireland asked 39 students—18 with mild depression—to estimate the duration of tones lasting between two and 65 seconds and to produce tones of specified lengths of time. Happier students overestimated intervals by 16 percent and produced tones that were short by 13 percent, compared with depressed students’ 3 percent underestimation and 8 percent overproduction.

[SOURCE](http://www.scientificamerican.com/article/depression-makes-time-estimates-more-accurate/?&WT.mc_id=SA_MB_20140702)