There is no standard sentence for a probation violation, and although there is a mandatory minimum sentence for the DUI violation a Judge would not be bound to set the mandatory minimum as the sentence in the case - if the Judge found reasons, the Judge could increase the sentence.
Steven F. Fairlie, Esq.
Fairlie & Lippy, P.C.
1501 Lower State Road, Suite 304
North Wales, PA 19454
voice: (215) 997-1000
fax: (215) 997-1777
There is not set sentence as Mr. Fairlie said however your friend could be sentenced to his total back time for the DUI less the time already spent in prison. He will not get credit for time he spent on the street.