According to FARs 61.15 and 61.16, after any DUI/alcohol-related motor vehicle action, you must
submit a report to the FAA Internal Security and Investigation Division within 60 days of the date of conviction or administrative action. Administrative action is the denial, suspension, cancellation, or revocation of a driver's license, or the failure of or refusal to take a Breathalyzer test.
Failure to file a report with the Internal Security Division within 60 days may result in the suspension of your airman certificate for up to 120 days.
"If you miss the 60-day deadline, it's best to file the report anyway. A report filed late is better than not reporting at all and having the discrepancy become apparent at the time of your next medical renewal," Crump said.