Lift off

I'm taking off tomorrow from the Montreal Trudeau airport at 5:30pm. The travel agent says to be at the airport 3 hours before takeoff. I'm thinking that's ridiculous. The packing is nearly done and I'm already beat. I'm going to go in a little later than normal to work and get out of there by 9 so I don't have to rush. It's going to be a long day...