Hah, this is a surprisingly difficult number for me to calculate! Most of my computer usage is on my reliable li'l Thinkpad. I also make regular use of the shared tower for more CPU-heavy tasks.
Meanwhile, I've got my family's Windows XP tower from my childhood (the first computer I ever coded on) under my desk, running like brand new. That's mostly for games and such.
Other than that, I've got a bunch of renovated laptops of different sorts, which I use for different testing scenarios. And, I've got an old Macbook for recording, and an old iMac G4 for, basically, randomness.
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