Board Thread:General Discussion/@comment-66.205.130.239-20140121012241/@comment-24492510-20141030193235

Actually, we know for sure this:

Many people think that every season lasted approximately 1 year, but this is provably wrong.
 * From the first season to the second season only some weeks/months passed.
 * From the second season to the third season about 1 year passed
 * From the third season to the fourth season about 1 year passed
 * From the fourth season to the fifth about 3 years passed!

Watch the first episode and the last episode of the first season... the first episode is clearly placed in early spring (at least in very late winter) and the last episode seems to be placed in late spring or in summer. Since Arthur's birthday (that occurs in episode 9) is placed sometime in late April, I assumed that the last episode is placed sometime in May, meaning from episode 1 to episode 13 about 2-3 months passed.

From the first episode to the last episode of the second season, about 2-3 months passed, since it is entirely placed in Autumn.

The other seasons last around 6 months, so...

7 AND A HALF YEARS PASSED!