Wirelessly posted (iPhone 4: Mozilla/5.0 (iPhone; CPU iPhone OS 5_0 like Mac OS X) AppleWebKit/534.46 (KHTML, like Gecko) Version/5.1 Mobile/9A334 Safari/7534.48.3)
If you check the airline booking system, CX/KA is always 50 min and 60 min for the majority rest (ferry and some other have some special arrangement)
I will say 55 min you will get bounced when you try to tag though the luggage.