(1) A quota period is 2 years, or such longer or shorter period (if any) as is determined under subsection (2).
(2) The Minister may, by legislative instrument, determine a period for the purposes of subsection (1).
(3) The first quota period starts on the 1 January specified by the Minister under section 26.
(4) Each quota period, except the first, starts immediately after the end of the last preceding one.