Drive BNE/OOL every week & BNE/MCY twice a week & you're nuts if you think you can do either in less than 90 mins, esp MCY with all the roadworks from BNE to Bruce hwy.
Good friend of mine drives daily Acacia Ridge to Kunda Park (Maroochydore) daily in a 12T truck speed limited to 100k and does the trip in 1 hour 20 minutes except if there are any incidents
9/10 trips are 1 hour 20 minutes or less
Depending where in Brisbane you start from, you can do the trip in under 1 hour from the north side on a good day