My personal records for *BSD are around 900 days, with 1200+ days on some Solaris systems (behind firewalls where they didn't need to be rebooted for kernel patches). The inevitable reboots actually happened when the UPS that they were behind tripped at the end of one of California's infamous rolling blackouts a few years back.
However, the important thing to remember in the case of BSD is that the drivers do have a central controlling structure which dictates what changes make it to release and also requires some fairly thorough testing, unlike with Windows, where the hardware manufacturer may release some very questionable code.
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