You will need to allow for time to take the tram from your car to the TTC, then time to purchase your ticket (if you do not already have), and then to take the monorail or ferry to the actual gate. When I was there last week, they started running the monorail about 30 minutes before opening. If you have a bag or backpack, you will have to have that checked at the gate by security (and wait for others in front of you to have theirs checked.) If you are there 1 hour before gate opening, you should have plenty of time. I arrived 1-1/2 hours before opening last week, and even had time to walk over to the Polynesian for a cup of coffee.