(1) An exemption:
(a) takes effect on the day stated in the instrument of exemption under paragraph 28(1)(e); and
(b) remains in force until the earliest of the following:
(i) if the exemption remains in force until a specified event occurs--the event occurs;
(ii) if the exemption remains in force for a specified period--the end of the specified period;
(iii) if applicable--the end of the period prescribed by the rules for the purposes of subsection (2);
(iv) the exemption is revoked under section 31.
(2) The rules may prescribe the period during which an exemption remains in force (which must not exceed 12 months). The rules may apply in relation to:
(a) exemptions generally; or
(b) exemptions for a kind of regulated waste material; or
(c) exemptions in relation to a place to which the regulated waste material may be exported.