The length of driver's license suspension after a DUI varies by state and circumstances, but common suspensions are:

• For a first DUI offense with a failed BAC test, the suspension is often around 6 months.
• If the driver refused a BAC test, the suspension can extend to 12 months or longer.
• For second or subsequent offenses, suspensions increase to 12 months or multiple years.
• Some states specify different suspension lengths, e.g., Florida suspends for 6 months to 1 year for a first offense, with longer suspensions for repeat offenses.
• Suspension generally starts after a notice period (e.g., 30 to 45 days from arrest).
• There may be administrative hearings available to contest the suspension.

Thus, after a DUI, a license suspension can range from about 6 months for a first offense up to several years for repeat offenses or refusal to take tests, with variation by jurisdiction.