Asking before I book my flights. I am arriving on Air Canada at BKK before connecting on a codeshare to HKT. I have a choice of a layover time of 2 hours 25 minutes, 2 hours 45 minutes, 4 hours 30 minutes, or 6 hours 15 minutes. Not sure how long the wait will be for customs etc. Will the 2 hours 45 minutes be enough, or should I choose the 4 hours 30 minutes. I don't want to allow time to eat a meal in the airport as I will be fed well enough on the plane.