Well, I put in Concord as you did not state where you were leaving from, but that does make a difference. You have to be honest with us OCD, otherwise this could get heated.
I also put in a faster than the speed limit assumption, but knowing how you feel about your boat I figured you would not be flying around on the side roads. I have a picture of you in my head crossing over the VA line with 30 min to go to deadline, boat fish tailing around corners to make in under the gun. Remember most trailer tires are not rated for speeds above 65, if you want to go faster you need to increase your tire pressure to help prevent a failure, that would really slow you down, but I will not hold something like that against your time, we will deduct for things like that.