I really should know the answer to this, but I honestly cannot remember.

I am travelling to SFO on UA in Y out of YVR in a couple of weeks and wondering how long the process takes if you have Nexus from check in to clear security at a busy period in the day?

I only have carry on, but I cannot remember if you must verify your documents with a check in agent. I know Nexus will get me through immigration quickly, but does it get priority security as well (not sure if this is just a benefit for domestic security)?

I feel like it should be no more than 20 minutes tops, but that is assuming that I don't have to verify any documents at check in and that I get priority security.

thanks