Up to 5 to 7 days. There have been people that have collected a vehicle 2 days after it has docked. Obviously if 2,000+ vehicles arrive it will take time to get through them all but some will be done almost immediately - it's a bit of a lottery when your vehicle will be ready.They do preparation at the port in Southampton which takes around 5-7 days. My M3 in Dec 2020 arrived 8 days prior to collection, even though my collection was at Southampton Docks!