Hello,We will have a 7 hour stopover in Guangzhou Baiyun

while travelling from Brisbane Australia, to Paris France. I have booked a room at a local to the airport hotel to rest and shower, so will need a 24hr TWOV. We have onward flights and Australian passports, so wondering how long it will take for the TWOV pass to be arrannged and where we go to organize it?
Thank you in advance for any help given.
Regards,
julie