When we applied about 18 months ago it took 3 - 4 weeks for the approval. Remember, when you apply for Nexus it has to be approved by both Canada & the U.S. I don't know about YYZ, but at the Detroit, Ambassador Bridge Nexus office you can usually get an appointment within a week. Last December we drove to Toronto to see friends & stopped at YYZ to go to the Nexus office to have the iris scan (can't be done in most U.S. offices). We walked in on a Friday afternoon & there was no one there waiting (granted, for just an iris scan you don't need an appointment) & we were done in 5 min., so if you get an approval and appointments are way out you might just try going over to YYZ on a Friday afternoon & see if they'll take you (the Nexus office is outside security so you can just walk in).