The no-bond designation tells you something important about how the court views his situation. When there is no bond, the system is signaling that they expect him to be remanded to custody after the hearing anyway, which removes the urgency around bringing him before a judge quickly. Probation violations, particularly combined with a third DWI, are treated as a serious breach of the leniency he was already shown. The court is in no rush.
There is no guaranteed timeline for how long he can be held before a hearing on a probation violation. Unlike a new arrest where constitutional protections around speedy appearance apply, probation violation proceedings move on a different track and courts have more flexibility in scheduling. Thirty-two days is not unusual, and it could stretch further depending on the docket.
To find out his current status and whether a hearing or sentencing has occurred, contact the Clerk of the Court in the county where he is being held. Court records are public information and the clerk's office can tell you what has been filed, whether a hearing date is set, and what the outcome has been if anything has already happened. You can do this by phone or email from Germany. Search for the clerk's contact information for the specific county.
Many courts also have online case lookup portals where you can search by his name and view the docket yourself without calling. Look for the county court's website and a public case access link.