It depends on the various statutes (which I'm just not sure of in this case), but judges at their discretion can usually sentence concurrently or consecutively. It wouldn't be unheard of for some of his charges to be concurrent and others to be consecutive, but that'll depend on the statute, the judge and potentially, the other jurisdictions where he continues to await trial (i.e., if he's convicted in his next trial, assuming that still takes place, that sentencing could happen consecutively or concurrently, depending on any number of variables).