They are 10 laps, but how long depends on how fast you go and how many times they have to slow everyone down because someone else crashed. If you drive fast, you can do laps in the 23-26 second range. The FAQ page on their website states that races last around 10 minutes but it varies due to what I mentioned above.
10 minutes per race.
15lap's. And have slots of fun.
Maybe 15 minutes. After your group races, a different group goes and when they're done your group races again if you sign up for more than one race.
Thanks! Your answer is awaiting moderation.