As per the NSW act
Schedule 3 Constitution of executive committee of the owners corporation and meetings of executive committee
(Section 20)
2. Constitution of executive committees for strata schemes with more than 2 lots
(1) This clause applies to an owners corporation for a strata scheme comprising more than 2 lots.
(2) The executive committee is to consist of such number of members, being not more than 9, as the owners corporation may determine.