docs: def wall_time_str(self, wall_time):
          """
          Returns the wall time in the format required for the sbatch script
          """
          days = int(wall_time // 1440)
          hours = int((wall_time - days * 1440) // 60)
          minutes = int(math.floor(wall_time - days * 1440 - hours * 60))
          seconds = int((wall_time - math.floor(wall_time)) * 60)
          return "{}-{:0>2}:{:0>2}:{:0>2}".format(days, hours, minutes, seconds)