Sprint heats 8:00
Sprint B-Main 9:00
Sprint A-Main 9:30ish

Just saying, last season we pulled it off just find, and this past Sunday ran 6 classes.
We ran 14 heat races, 6 features in 3 hours.
There were race cars on track nearly every minute (unless track work), with little down time.

Love jrp4554 post above (a least some notice the crews great work).....and notice lots of likes,
sometimes gotta let actions do your talking )
Keep in mind the karts run smaller venue, fasten your seat belts and hold on.....