They end when the last cars go. The time frame is just an estimate. If there are wrecks or oil on the track it can take a long time to fix. Of course you can leave when ever you like. Usually the very last thing is an exposition like a wheel stander or rocket cars.
If I remember correctly it ends later than 5:00 I think it ends closer to about 9:00 or 10:00 pm
5 pm
Start time has been moved closer to 530
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