Can I stay for 72 hrs transit in Guangzhou on the outbound flight, 6 days in Beijing visa free?

Flight 1Fri, 26 Apr 2019
China Southern
22:30MEL
9h 30
Direct
06:00+1
CAN
Flight 2Tue, 30 Apr 2019
China Southern
11:05CAN
3h 20
Direct
15:25ICN
Flight 3Sun, 12 May 2019
China Southern
10:40ICN
2h 25
Direct
12:05PEK
Operated by Korean Air
Flight 4Thu, 16 May 2019
China Southern
13:00PEK
15h 20
1 stop
SZX
06:20+1
MEL