How long will it take to get heirship certificate passed from HC

My mother was murdered by my father and he was sentenced to prison under section 302 . I applied for legal heirship certificate to transfer 2 flats which were on my mothers name. one year later the result was declared in my favour (as my father is barred since he commited murder) for only one property whose original documents were in my custody. As the original flat documents of other flat were not available i could not get heirship for the 2 nd flat. And the lawyer made mistake in the beginning of application of not mentioning to court that the 2nd flat documents were only xerox copies and not original .So in the end the judgement was passed successfully for only one flat whose documents I had , the other flat was rejected. then we filled review application as we got documents of 2nd flat with registrar. but it was rejected to as we earlier had xerox. q.2 If i apply in high court . how much time will the court take to pass judgement. the district court took three years