There is already a Security Update for OS X [MacCentral]. Apple seems to keep on posting security fixes regularly.
At least the software update system makes installing these a breeze, but every now and then an update reguires a restart. There goes a new uptime record.

My record with Mac OS X in reqular daily production use is 69 days - then the Mac went down because of a power failure which took down the whole office wing. After that I have been too keen on installing new software and updates to get much beyond 60 days.