Viewers appointed to assess the damages and benefits due to the appropriation, injury or destruction of land, property and materials shall make their reports within a time which the court shall fix when so appointing them. If the viewers so appointed shall, for any reason appearing sufficient to the court, be unable to file their report within the period so fixed, the court may, either before or after the expiration of the time fixed, extend the time for the filing of such report.
16 P.S. § 5622