My question involves criminal law for the state of: Georgia

Okay, my stepbrother is 17yrs old, and 17 year old people get charged as adults for crimes in Georgia. So he'll be charged as an adult. Anyway, he burglarized five houses in one day, so he may be charged with more burglary charges. Also, he also vandalized one of the victim's home to the tune of $22,000 dollars, in addition to stealing from the home. He was also charged with GTA and is one probation for three years already. So my question is, barring there are no more charges than the five homes and the vandalism, does anyone know the ballpark figure on jail time? How much trouble is he in?