My experience is that QR is incapable of calculating flight times and getting departure or arrival times correct when there is a DST change in one country. So far I have two trips booked for the October - March season and on checking manage my booking I saw that the departure from my home airport had been brought forward by an hour since booking, the arrival time was more or less the same and the block time was the same. The same thing happened earlier this year when I travelled to Sydney and the actual arrival time was an hour later than it was shown as when I booked.

My advice, check MMB regularly as QR will not advise you of a timing change.