Originally Posted by lokijuh ...
... If you are a "last-minute" sort of person you'll be fine. If you're the sort of person who likes checking in for a 1pm flight at 9:30am just in case things go awry - forget it and stay at the airport, ...
I deliberately used the term 'comfortably' to qualify the time I was giving.
Indeed, if you already have your BP, you could still depart the CBD at 10:30 and likely make boarding commencement at 11:29.
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FWIW, I'm the sort of person who will check in at 6pm for an 9pm flight for many reasons including a desire to ensure consistent turnover of HP's in the QP's ... 
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