You should have roughly an hour to wait in the interim period, so yep plenty of time assuming no delays or problems in the transfer.
As for the where... If you are AU you can use the ones in the HKG CH easy
Other than that there are a fair amount of pay access lounges and rest areas in the departures area so give it a google and pick a lounge. Sorry I cannot recommend any in particular other than the VS CH - one of my favs of the world. Service second to none and the space on the balcony is awesome.
Let us know which lounge you go for 8D