I'm at about the 16k mile mark on my '08 and I'm getting ready to wheel it down into the basement for the duration of the winter. My manual says to check the valves at 16k, which I plan to do. Even if it takes me a month, off and on, to check them, order any shims and makes some adjustments it's a whole lot cheaper than paying a shop to do it.
Plus, I don't always trust a shop to do it precisely. On my old FJ1100 Yamaha I took it in for its first inspection, which included valve adjustment. They claimed they did the work. However, on subsequent maintenance intervals I started checking and doing it myself. The first time I had to adjust many valves. Each time after that hardly, if any, of them were out of spec. I question whether the shop even checked them at all.
When I do it I might take a lot longer but I'm not riding the bike over the winter anyway. Plus, when I'm finished I know it has been done right.