My question involves criminal law for the state of: CO and NC

My son was accused of Misdemeanor Assault with Domestic Violence in CO. He accepted a deferred judgment sentence with 18 month probation. Unfortunately he violated his probation by not completing his DV classes, and on the last day of his probation the state of CO issued a hold for him in NC (his state of residence). He has been in the NC County jail for over three weeks now awaiting CO to come pick him up. I have a couple of questions:

1 - Since he just needs to be sentenced doesn't "right to a speedy trial" apply in this case? If yes, how do i invoke this right?
2 - Is there any time limit for him to be held? Can he be held indefinitely?

Thanks in advance for any help.