Pledging Across Christmas/New Year or across Summer

[naraht]

I'm pretty sure that the Alpha Phi Omega chapter at University of Virginia runs their pledging across semesters (rush in 2014 runs from October 27th to November 12, and pledging is a minimum of 6 weeks, so...)

I'm curious as to whether this happens anywhere else? In the broadest sense, I'm looking for where it is standard for the pledging process to start in one school semester and end in another. (Or if there is a trimester system, for pledging to cross the new year)