Are you thinking of San Antonio? That's closer to 8 hours, but Austin is about 4 hours. I've driven Austin to Plano more than once and google maps agrees. Obviously time of day matters because you'd have to navigate traffic all the way through Dallas, but I can't see it being 8 hours under any traffic conditions. And you could also fly. As I recall, it's about a 30-40 minute flight.
Personally, if you're considering an ablation I would fly halfway around the world to use him. But are you just looking for an EP to manage your afib rather than do an ablation?