The lookback period represents how long Florida will look back into your past to determine how many DUIs you have on your record. Florida’s lookback period for a third DUI is 10 years. That means if your second, third , fourth, or most recent DUI was more than 10 years ago, it will not be held against you in determining whether to charge you with a felony. Keep in mind, however, that the lookback period for a second offense is only five years, and while a second offense is still considered only a misdemeanor, it still carries significantly enhanced penalties.