I know a guy who had the previous generation Accord motor (F23) and it suffered a burned valve at about 260k. I don't know about this generation.
I adjusted the valves on my F23 Honda (it's at 295k now); it's really not a big job to do on that motor. I don't know how the K24 compares in ease or need of adjustment.
On my Volvo, adjusting valves is very hard to do, and it's only done if the head is being rebuilt.