New 13th Birthday Anniversary Celebration Quests to Be Around Longer, Old Ones Shorter

From this SOE forum post:

The 13th anniversary events this year last for 13 weeks.  The older events should last 1 month.  The usual reason for the extension is when there are gating [sic] bugs.  Those were fixed for previous ones.  We of course hope we have none for the new ones.

In previous years the anniversary events lasted for six weeks, so the older events will actually be around for two weeks less than previous years.