Congrats on getting closer to the big day! I WISH we were only 39 days out from our next trip, but sadly, it will be a while for us. But it always goes by so quick, so I know our trip will be here before too long too.
I see we are practically neighbours. I live an hour north of you in Sarnia, Ontario (across from Port Huron, MI). It looks like we basically will end up with the exact same drive schedule, as I left our house at 5am every trip (4 of them since 2005) which means we would have been driving through your neck of the woods on the I94 around 6ish each time. My wife and I usually switch out every few hours though so that we both can stay fresh behind the wheel. In all honesty, I usually start out like gangbusters and go for a long stretch before my right leg starts cramping up and then I can only go an hour or two at a time after that. So I am fortunate that my wife doesn't mind driving long distances, for all of our sake.
I started keeping a driving journal that I take with me each trip to write down when we cross over into each State and when we stop for meals or gas and that. It probably seems like a stupid idea to most people, but after I did it that first time and took it the next trip, I kinda liked being able to see where we were in comparison to the same time the trip before. I write down gas prices and how much it took to fill it up and where we pulled over each trip.
Anyways, to the point of your thread. Like I said, we leave at exactly the same time as you from exactly the same starting point and take I75 all the way down before pulling over for the night in either Adel, GA or Valdosta, GA between 10-11pm, depending on how bad the weather was on the way down (we've hit wicked snowstorms the past couple of trips) and how many times we stopped for fuel and food. We wake up the next day and leave around 9ish and usually pull into Pop Century in WDW between 1-2pm. On all four of our trips, we've driven straight through without stopping on the way home and I don't think I will be doing it ever again. It really takes more out of you than one would imagine.
Sorry for the long post. Hope you all have a wonderful trip and enjoy the drive down!