Unless he harmed somebody, there should be a limitation on how long the state can withhold punishment, before it becomes invalid.
The governor has the power to relieve the guy of his sentence. If I were the governor, I’d ask for an independent review....sit over it for a week to consider risks, and just give the guy a suspension. The guy was that one out of a hundred who needed a kick in the pants to get himself motivated. Most wouldn’t have cleaned themselves up. Besides, if you imprison the guy....you the taxpayer end up paying for his period in jail....are you getting any value?