Answer:
If the person is being held for extradition. once the process has begun it takes as long as it takes. It is nowhere near as easy as simply driving over the state line and picking them up. A formal inter-state legal and administrative process must be begun and followed in order to legally take custody of the defendant and remove them from one state to another. If you haven't heard anything in 30 days file a Writ of Habeus Corpus to determine where the process stands.