Do I need to apply for a double entry visa?

I am flying Brisbane to Almaty via Guangzhou where I have a 20 hr 20 min stopover (from 1630 to 1250 the next day) so I would like to stay in a hotel overnight. My return trip from Ashgabat to Brisbane is via Guangzhou where I have another long stopover (from 1425 to 2100 the next day) so again I would like to stay in a hotel overnight.