what is the mininum sentence for a habitual violator for dui?

The short answer:  If the person is actually charged and convicted of a fourth DUI, it can be a felony punishable from one (1) to five (5) years in prison or on probation; 90 days in jail is the minimum, $1000 in fines minimum and up to additional $4,000 in fines. There are numerous other conditions that can aggravate the sentence including but not limited to: Defendant's driving record, children in the car, other convictions, prior probation violations, etc. etc.