Beware that summer season generally brings peak wait times up.
I left YVR last friday morning (8:30 am departure) and it took 1+hours.
6:30 times should be better, but allow for an hour IMO.
Into YVR you're at the mercy of your timing against jumbo jets from Asia/Europe. I've literally walked right up to an agent with no wait, and have waited 1.5 hours.