How much time does a class U felony hold involving injury?

I think you are referring to the 'U' on CCAP, which stands for 'unclassified.' I am aware of unclassified misdemeanors; unclassified felonies are a rarer breed. In any event, the statutes only set out maximums (when they do so); the actual penalty in any particular case is up to the judge, who considers quite a few factors.