Typically, the prosecution is in no rush for probation violations seeking a court date. The normal rule of thumb from the prosecutor's perspective is a violator is highly likely to receive jail time. With that knowledge, they are not in a hurry to give a definite date - he will be given "time-served" for his current stay.
https://www.inmateaid.com/ask-the-inmate/how-soon-will-my-boyfriend-have-a-court-date-for-violation-of-probation#answer
Accepted Answer Date Created: February 06,2016