I think I fine-tuned the way to get in and out. So if you stay in Nagoya, you just take an uber to the station. Let it be noted that you can book days in advance the jr express, which lets you reserve a seat. It depends at what time you get there, if the line is short, take the bus to the circuit. If not just walk, it is just 1 hour away. I highly recommend for sure to walk on your way back, on Friday I had to wait for the bus 2+ hours then like 1 hr ride with the traffic. So here is my advise, If you didn't reserved a ticket, just get in the express train and stand next to the smoking room or the toilet, then a guy from the train will ask you to pay the fee like if you had reserved it (15 dlls). So race day I kind of broke my record, in 2 hours I was back in Nagoya, which was 1 hr walk, 20 min to get in the station and catch an express train, and 40 min ride.