I have been once before. About a month before I bought my busa. I was tired by the end of the day. It shouldn't be a problem because I live only a half hour away so I should be well rested. Also, I drag raced the busa and a rear engine dragster every weekend this summer. So I should be well adapted to long days and back to back days. But I know only to push it to about 85% of my ability as to leave 15% for learning. And not going down would keep the day on the good side of things.if this is your very first track day, you will be dog tired after day one. day 2 might be painful and not up to par. just a thought. But, I'd never discourage two days of track riding!!