How much time is he looking at his rap sheet is bad he has about 8 fellonys 3 prison tirms

To figure out his exposure, I would need to know exact charges, if any prior convictions are alleged and what code sections are listed regarding his priors. Generally, DAs don't usually go below what the last prison term was but this can be negotiated depending on the circumstances of the new charges.

His priors are drug possession, thrift

THrift, even in this free spending economy, is not a crime. If you meant theft and hit the wrong key, your question still can't be answered because too many details are missing. He should have PD or a private attorney.