Unfortunately being a 2015 it's only heated seats.I have a similar work situation. I drive between Pensacola, FL and Tampa, FL 2-3 weeks out of the month which is a bit over 400miles. I have a 2021 LR model 3 which I only have to stop once for about 25 mins if I start at 100% from home. Going home from the customer site on Friday afternoons at about 50% charge I have to stop 3 times. I don't stay the weekends as I want to be home as much as I can and my company pays for travel expenses during the week and to drive home. With all that being said, the Tesla is my wife's daily driver (105 miles round trip per day) and I either drive my personal Ford Expedition or my company rents me a traditional rental car. I am 6'4" 240lbs. I do not like road tripping in the Tesla, too small and no vented seats so in the Florida heat I get swamp butt. My preference is driving my gas hog Ford Expedition which is more comfortable to road trip in, plus I put my bicycle in the cargo area of the Expedition.
I wouldn't purchase a model 3 just to reduce your commute time by an hour, keep your model s which hopefully has heated/cooled seats as the model 3 only has heated seats.