A child against whom a community service order is made must perform the number of hours of community service specified in the order—
(a) within—(i) for a community service order of less than 50 hours—the period of 1 year starting on the date of the order or, if the order states a lesser period, the lesser period; or(ii) otherwise—the period of 1 year starting on the date of the order; or
(b) within any extended period that a court may order under section 245 (1) (b) (ii) or 247 ; or
(c) any extended period allowed by order of the proper officer of the court under section 252 .