My boyfriend is on juvenile probation but he's 18. He finished all his requirements and it's the end of his probation time we paid all his court fines and everything else how long do we have to wait for his papers?

You can contact the Clerk of Court and see if the paperwork has even been filed. Some states don't send any termination of probation paperwork, some states do send it. Call and find out if in fact your state does or does not send paperwork out.