If you're using the Valet Parking service, enter the time you plan to arrive at the airport terminal and then when you return from your trip, enter the time you expect to be outside the airport after you've landed and collected your bags. This is roughly 1 hour after landing. Try to contact your parking provider as soon as you have landed so that they can make the necessary arrangements and bring your car to you. That way you don't have to spend any time waiting. If you're using Shuttle Parking then you should fill in the time that you are going to arrive at the car park. For your return, you should enter the time that you think you will be ready to get on the shuttle bus. When arriving before your holiday, it's best to give yourself half an hour for the handling time and travel time to the terminal via the shuttle bus. Upon return, you should allow approximately 1 hour after landing so you have time to pick up your luggage and/or go through passport control.