Today I changed the fuel filter on my 06 DuraMax. My first time doing it myself just wanted to say what a breeze. Maybe an hour total including the reset on the DIC. Kinda fun. :)
I have a '06 Duramax also and I can change my filter in less time than it takes to get out and then put the tools back up. It isn't a hard thing to do, but like most tasks it gets faster after the first time. I remove my right side battery to make getting to the filter easier (yes I do tape up the positive lead after removal). I have replaced my filter 9 times so far so I can just about do it blindfolded.