The 14 mins where Aussie ranks were depleted due to yellow cards took 18 mins to complete with the ball in play for all of 6 mins 36 secs (with about 5 mins of that being in Welsh hands).
One of the two Welsh scrums took 2 mins 41 secs of the 10 min period where Aussie were down to 13 men. You have to question the logic of choosing the lottery that is the scrum when a line out, penalty move or even a kick at goal would deliver a more reliable and time efficient outcome.
On a different day one of the three scoring opportunities during this period would have landed and / or another yellow card would have been issued. But you have to take your hat off to the Aussie defence, incredible.