Help! How long does it take for new immigrants to land in Vancouver for customs clearance?

I arrived in Vancouver on August 3rd, and waited for about 2 hours at the immigration office. My personal login process took about 15 minutes. As a result, I missed the flight to Montreal (the interval between the two flights was less than 2 hours), but went to the domestic flight transfer office to talk to the people of Air Canada (that is, to handle the landing of new immigrants), and they would arrange the latest flight. I missed the plane at 2 pm, and they arranged it for 4 pm.