Generally, casting directors aim to respond to actors within a reasonable timeframe to ensure efficiency in the casting process. In some cases, actors may be contacted within a few days or weeks if they are among the top choices for the role. However, it is also possible that actors may not receive any notification if they are not selected.
Actors can increase their chances of getting a callback or response by following the instructions in the casting call, preparing well for the audition, and submitting a professional and accurate audition. It's also important for actors to be patient during the casting process, as it may take some time for the project team to make a final decision.