§  5.71   License period.

   (a) The regular license period for stations in the Experimental Radio
   Service is either 2 or 5 years. An applicant desiring to apply for a
   5-year license must provide justification for its need for a license of
   that duration. A license may be renewed upon an adequate showing of
   need.

   (b) A license will not be granted for a period longer than that which
   is required for completion of the experimental project. If such period
   is estimated to be less than 2 years, or between 2–5 years, a statement
   to that effect by the applicant may facilitate grant of the
   application. See also § 5.69 of this part.