The minimum jail time for a regular first-offense DUI in Arizona is one day in jail. Prior to the 2012 revisions, the law stipulated that the convicted had to spend a full 24 hours in jail to complete the sentence. A seemingly insignificant change in the wording has now made an earlier release a possibility. The law now states that the convicted must spend one day, rather than 24 hours, in jail. This new wording makes the interpretation of “one day” more subjective, allowing for an earlier release.