Your Kid's High Attention Span
Seriously, being able to concentrate and having a long attention span will serve your kid well in school—and in life. Now if only YOU had an attention span that long. Not an easy thing when you're getting interrupted every five minutes ...
Kids with high attention spans tend to get fully absorbed in whatever it is they're doing. They also tend to be able to entertain themselves for long periods. That's all good stuff! The only problem is when you want your kid to stop reading/building with Lego/painting and he is so immersed in his project that he doesn't want take a break.
Sure, having a kid with a super-long attention span can be annoying in those cases. But for the most part, having a high attention span will serve your kid well. Once your kid starts a project chances are good that he'll finish it. Hopefully, that includes cleaning his room!