The COVID-19 Legislation Amendment (Emergency Measures) Act No 1 2020 (NSW) amended the Public Health Act 2010 No 127 (NSW). Under sections 7 and 8, public health orders of indefinite length may be made in relation to the COVID-19 pandemic. Previously, a public health order would expire at the end of 3 business days unless confirmed by the NSW Civil and Administrative Tribunal.
These amendments will expire 12 months from commencement on 25 March 2022.
More information here.