it could take several days, also depends how many people show up. you should get professional pictures only because if they aren't satisfied with them they will ask for news ones and that can delay your process. If your not from the area where your open day/assessment is i would bring your passport,high school certificate and your references. I am from new york and when i had my open day/assessment in Dublin i went and got professional pictures done after my final interview and left them at the front desk of the hotel. As I say it is better to be more prepared than not.
