I was at DRW a couple of weeks ago and the QC even opened at 12:30am for a 2:00am BNE departure.Darwin opens for several blocks - eg on Friday I had a 1055 flight, the lounge opened 90 minutes before (0925), but was previously opened 0500-0600 to serve the early morning flight. Then it opened again in the evening.
The QF website has the same note for DRW as it does for TSV - so I'd expect it to be the same - it will stay open if there's a cluster of flights, but will still close for a few hours if not.
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