Don't know about the GCAA, but the FAA have a 40-48 hour rule for US operators of ULRs (16hrs). The problem is that you're allowed to 'buy' your way out of the procedure by paying a financial penalty to roster only 24 hour layovers between ULRs.
At present only Delta Airlines is complying with the 48-hour rule, unless things have changed the last couple of years...
Last edited by Mr Good Cat; 4th Jul 2014 at 14:49.