Reviewed on: April 22,2026
Sentencing Questions

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

My son was sentenced to a year on a 4th DUI charge. What is the normal length of time he will spend in jail?

On a one-year sentence, the realistic expectation is somewhere around 10 months.
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Answered by a former federal inmate · 14+ years advising families
✓ Verified answer July 20,2016 · Sentencing Questions
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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.

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Accepted Answer Date Created: July 20,2016
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About this answer: This response was prepared by InmateAid’s editorial team in consultation with former inmates who have direct experience with the federal correctional system. InmateAid has served families of the incarcerated since 2012. This is general information only — not legal advice. Last reviewed April 2026.