Moxnix and I did 40-50 events in one season, but that was divided by at least 3 cars, mostly the Miata in ES prep. It was fun, but tiring. That is 19 weekends, assuming you are doing Sat./Sun. events and 4 weekends per month, that's 5 solid months of nothing but autox every weekend. We burned out a bit on that and have kept it around 15 events per year since then.