Here are the factors that affect what time we leave for the MoBay airport:
What time is your flight?
What day of the week are you flying?
Will you be in rush hour traffic going into MoBay?
Did you pack the night before?
Did you stay out late?
How many people in your group and are some of them not very "timely" or organized?

Are you planning on eating before the airport?
Are you checking luggage?
Did you pay for MoBay Club departure service?
Do you need to shop at the Duty Free Shops?