(a) Duration. An institution may award a fellowship to a student for -
(1) One academic year; or
(2) One summer session if the summer session provides the fellow with the equivalent of one academic year of modern foreign language study.
(b) Vacancies. If a fellow vacates a fellowship before the end of an award period, the institution to which the fellowship is allocated may reaward the balance of the fellowship to another student if -
(1) The student meets the eligibility requirements in § 657.3; and
(2) The remaining fellowship period comprises at least one full academic quarter, semester, trimester, or summer session as described in paragraph (a)(2) of this section.