My husband is in jail and one of the inmates in his cell block has been told he has scabies they have been treated what is the quarantine time frame?

No standard: Even in the close environment of a jail, scabies is most likely to be transmitted by direct touch. Once treatment has begun, transmission is unlikely unless there are crusts -- if so, isolation is appropriate until the crusts are healed. That's the best I could remember / find. I'm glad that your love is enduring despite this trying time and I know you are a strength for him. Best wishes.