In any two-year period a person may not be required:

1. (1) To serve or attend court for prospective service as a juror more than thirty court days, except if necessary to complete service in a particular case;
2. (2) To serve on more than one grand jury;
3. (3) To serve as both a grand and petit juror; or
4. (4) To serve as a petit juror at more than one term of court.