He'd need to leave his wifeand child's bedside at Wellington Hospital by 6am to check-in and board NZ406 departing Wellington at 7am.
If on schedule, Smith's flight would land in Auckland at 8am.
With no check-in baggage and some forgiving All Black fans as ground staff to fast-track him through customs he could make flight NZ103 departing Auckland International Airport at 9am.
That flight, Smith's last possible chance to make the game, lands at Sydney Airport at 10.30am local time (12.30pm NZT).
Accounting for a presumably busier terminal staffed by less-forgiving, Wallaby-supporting workers, it would likely take Smith until 12.30pm (2.30pm NZT) to make it through security.
Assuming the player would like to travel in the privacy of a taxi - rather than use public transport - and that he would likely hit traffic in the city, he could arrive at ANZ Stadium in central Sydney by 1.30pm.
Plenty of time to charge the cab to his All Black MasterCard and have stand-in Malakai Fekitoa pass his shirt back.