Arriving to CAN on 28/11 as aircrew from IST, visiting HKG 2 days, back to CAN 24hrs. then to IST.

Holder of Argentinean passp. I'll be arriving to CAN from IST on 28/11 as active aircrew .
Planning on 29/11 to go HKG for 2 days leisure, then back to CAN on 1/12, to fly as active aircrew back to IST on 2/12 .
Do I qualify for the 72 hours free visa ?? coming from HKG to CAN and 24hrs. later flight to IST .

Thanks & Rgds.
Luis