How Long Will My Son Serve on a Fourth DUI Conviction?

On a one-year sentence, the realistic expectation is somewhere around 10 months. Most jail and prison systems apply good conduct credits that reduce actual time served, typically resulting in inmates serving roughly 80 to 85 percent of the stated sentence when their record stays clean. On 12 months, that math puts release in the 10 to 10.5 month range under normal circumstances.

That estimate assumes no disciplinary issues while he is inside and no other complicating factors in his history that might affect how the facility manages his case. A fourth DUI indicates a pattern that some jurisdictions treat more seriously than others, so the exact percentage of time served can vary depending on the state and the specific facility.

If he had any time in custody between arrest and sentencing, that should be credited against the sentence and would move the release date earlier. It is worth confirming with his attorney that any pre-sentencing jail time was properly applied.