I'm with Mckbrew- I don't do any routine maintanence type stuff, and since I'm using cobra taps, no faucets to clean. When the keg is empty, I rinse it out. I sanitize it, and then fill with brew. I do sometimes take off the posts and clean it well, and inspect the o-rings, but that's still about what? 5 minutes?
I thought kegging would be tougher than it is. It's a piece of cake, and if I want to bring a growler or two with me out fishing or to to cottage, or even fill plastic soda bottles for the lake, it takes a couple of minutes or less. No way would I want to go back to bottling!
One of the other things I like is that when I do take some homebrew with me, there is NO sediment at all. So, I can throw a bottle in my fishing gear and not worry about careful pours and mixing it up. My non-homebrew making friends really appreciated this!