a 20 day sentence? he'll likely be out before anyone has a chance to do anything.
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Mr. Solis is correct that the difference between a 5 day to 3 day sentence will take longer to address with the sentencing judge than he will actually serve in jail
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For practical purposes, probably not much to change anything.
Academically or hypothetically, his family can ask the public defender to put the matter on calendar on Monday and ask for a nun pro tunc order correcting the sentence to what the public defender believes it is. However, by the time the corrected order makes it to the jail and the release date is fixed, he will probably already be released.