There is no magic number. It is up to the discretion of the judge. If you keep appearing without a lawyer, the judge may lock you up to ensure that you wil receive a public defender.
My colleagues are correct. I write separately to note that continuances of the preliminary hearing are granted by the District Justice, whereas a trial continuance is granted by the Common Pleas judge.
A defendant may request as many continuances as he or she can demonstrate good cause for the request. If the court determines the request is for mere delay and not for good cause, the court does not lack the means to move matters along.
No one can give you an exact answer as it is completely up to the judge.
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