At the moment I'm beginning my Ph.D. in statistics at Iowa State, so the school year is pretty much filled with classes - at least until I reach the dissertation stage. That leaves summers. I'm not completely sure what I'll be doing this summer, but I'm about 90% sure I'll be taking a summer class to brush up on some math so I'm ready for measure theory in the fall. If the timing of that class is bad, I may not have more than a contiguous week free over the summer. Next summer I expect to have more disposable time.