Section 202(14)(iii) in The Naval Ceremonial, Conditions Of Service And Miscellaneous Regulations, 1964
(iii)from the date of the conclusion of the course to the date of the officer reports back for duty, or on completion of any leave (not exceeding 60 days) granted at the end of the course, whichever is earlier. Thereafter, the retention of acting rank shall be governed by the normal regulations;