League tracks are 42', but it will not matter much, as there are so many variables that will keep the times on your track different than those on the league track. You will want to keep a spreadsheet to develop a relationship between the times on a test track vs the times on a league track. With that information, you can "predict" the times you expect to see on the league track. I personally use a 35' track and have all the information I need to be competitive (if I knew how to prep a car). If you are willing to drive about 4 hours or so, I know of a two lane league track for sale with a micro wizard timer. It s a good deal and in all likelihood, well taken care of.