Obsession Cycles

I've rediscovered chess. Again.

Right now all I want to do is play chess, read about chess, do chess puzzles, study my old chess games, install chess software, etc. I've entered another USCF correspondence chess tournament. I'm searching for local chess clubs on the off chance I'll get a free night to play over-the-board (I only play correspondence and/or internet chess, since having a medical resident for a wife and a 6-year-old daughter don't leave much time for OTB play).

But give it another few months, and I'll burn the chess obsession right out of myself. Just like I've done the last 10-15 years.

Chess isn't the only "obsession cycle" I go through. I have my Magic: The Gathering cycles, fantasy sports cycles (which I tend to burn through faster than other obsessions), and "I'm-gonna-freelance-in-my-spare-time" cycles. My reading tastes seem to burn just as brightly -- I just came out of an epic fantasy cycle, and I'm now in a space opera cycle. In a few months, I'll go into a mystery cycle and read any mystery that falls in my lap (or onto my Kindle).

Fortunately my fiction writing "obsession" is the only thing that's stayed constant my whole life. I'm at least disciplined enough to finish my writing quota and then reward myself with my obsession-of-the-moment.

Do you have any "obsession cycles"? What are they and how long do they last? And please keep the comments clean... ;-)