In most states, when someone is arrested for DUI, DWI, or a related drunk driving offense, there are really two cases: the court case, involving the possibility of jail, fines, community service, and other punishments, and the DMV case, where the person's driver's license is in jeopardy.
The DMV case is triggered by the arrest. The officer takes away the license and sends it to the DMV. Unless a hearing is requested on a timely basis, usually within just a few days, the driver's license will be suspended automatically. The length of the suspension will vary from state to state, and also depend upon whether the arrest is the first offense or not. Whether or not a restricted or provisional license can be obtained, so the person accused of DUI or DWI can at least drive to and from work will also vary from state to state.