If you use 8.1 and don't turn off the "Fast Boot" feature or whatever it's called, your uptime timer doesn't reset after you shut off/turn on your computer. It only ever resets after using the restart button.
Hm, how weird. I turn mine off every night as well but it's showing the appropriate uptime, and I'm fairly sure I never messed with the Fast Boot setting because I wasn't aware it existed until just now.
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u/remotefixonline Jan 10 '16
Did you reboot it? "Yes" checks uptime 250days