I would start in NC and turn around or finish where and when it makes the most since. It will depend alot on who I am traveling with. If I go solo the I will go until Ive had enough, hopefully to all the way to Oregon. If am traveling with others it will be determined on a mutually agreed upon ride plan prior to departure. I plan to be retired by next summer so I will have a little more freedom on my timeline. That being said even the best plans are subject to change the second you pull out of the driveway.