An average drunk driver has driven drunk over 80 times before first arrest.

Arrest data: Federal Bureau of Investigation, “Crime in the United States: 2014” https://www.fbi.gov/about-us/cjis/ucr/crime-in-the-u.s/2014/crime-in-the-u.s.-2014/tables/table-29 Incidence data: Centers for Disease Control and Prevention. “Alcohol-Impaired Driving Among Adults — United States, 2012.” Morbidity and Mortality Weekly Report. August 7, 2015 / 64(30);814-817.
http://www.cdc.gov/mmwr/preview/mmwrhtml/mm6430a2.htm