SWMBO and I did a 10-hr drive during the Christmas break. Well, I did a 10 hr drive, she did a 6 hr nap interspersed with chatty moments and occasional potty breaks. Long drives not only don't bother me, I find they're actually kinda therapeutic in a Zen sorta way. I don't get in any big rush, always have music and audio books going, and like to see the scenery. Since we both have bladders like 10 year olds, taking regular stops to stretch and catch a breath is not an issue at all. That being said, 8-10 hours is about the limit of what we prefer. Fortunately that gets us to most of the places we like to visit without undue overnight stops along the way.
Brad