EqD Article: www.equestriadaily.com/2012/06…
Excel sheet download: (see link to seasons 1-3)
Depending on the number of characters present and frequency of shots' changes, analyzing each episode took from less than an hour up to three.
Estimated total time spent: 110 - 150 hours.
Margin of error:
Since the timers of the video players I used show only full seconds, I had to guess how the fractions of seconds were long when added up together.
On average, in each episode there may be a 10 second difference between the real screentime of a character and the screentime I calculated - but since it can be either more or less than reality, given the number of episodes and the fact that all of the characters are prone to this miscalculation, the overall screentime difference will probably be negligable.
Seasons 1-3 analysis: fav.me/d5kzo28
Ponyville's population analysis: fav.me/d4uyijp
Birth, pregnancy, coitus & death statistics: fav.me/d5fd4rz