Lizzy is correct, QF had (not sure if still do as do not fly for them any more) a 3 day PER-SIN, SIN-PER-SIN, SIN-PER pattern (shuttle done with 4 seats in the cabin which rarely got used and at most 1 hour at a time to bolt down some food) which averaged 12.5hrs but regularly blew out to 14hr (ok under the EBA which was 16 with delay)
and the much hated PER-CGK-PER back of the clock (with no 'legal' crew rest, often taken by sneaky use of a free row of seats in shifts of two, while the pilots paxed back with a new lot picked up in CGK operating)
Eventually we got a taxi voucher for use on the way home to avoid driving tired after several crew had car accidents. Fat lot of good it was if you were single and had to drive to the airport in the first place. This then changed to a car pickup from home but you sometimes got a taxi back but sometimes ended up paying yourself.
So JQ weren't the only ones doing flying like this. Flew JQ recently (had no other 'choice', how ironic) and the crew told me their rostered duty was 12:45, they'd snagged some seats at the back to make use of but would probably end up doing closer to 14 as the flight came in late and we left an hour behind schedule, they were then going on another sector after dropping us off. (This was under the 'Team Jetstar' arrangement where they do not get o/t after 8hr 45 like QF crew do/did)