Unlike standard trains, Eurostar involves airport-style security and border checks before you board. At major hubs like London St Pancras or Paris Gare du Nord, the process usually takes between 30 and 45 minutes, but during peak holiday periods or Friday evenings, it can stretch to over 90 minutes. You must clear two passport controls: one for the country you are leaving and one for the country you are entering (juxtaposed controls). While the physical security check is faster than an airport because there are no liquid restrictions, the manual passport lines can be slow. Eurostar recommends arriving 60 to 90 minutes before departure for Standard passengers, while Business Premier travelers can often breeze through in 15 to 20 minutes thanks to dedicated lanes. Always factor in extra time if you are using a non-biometric passport.