Hello!
Depends on a number of factors.
General concensus is that wait at the dockside in Emden depends on proximity (timewise) to new plate week and where it's going. Tyne bound cars (generally Tyne-Tees region + Scotland) usually get moving in a week, Sheerness and Grimsby cars can sit at Emden for 2 to 3 weeks.
Once on a ship, the crossing to the UK is less than 24 hours, to either of the 3 destinations. Tyne-bound cars going to a dealership close to Tyne dock can go to the dealerships in less than 4 days, Grimsby/Sheerness cars usually take 1-2 weeks.
Your car will probably be going to Sheerness. If you're very lucky, now the rush to get cars to dealerships for March 1st is out of the way, your car could be ready to collect 3 weeks after arriving at Emden. As the plate rush is now passed, the dealership will be a lot quieter,, so your car may not be at the back of a long queue to get PDI'd for handover.
I've had a car less than 8 days from arrival at Emden, but my dealership is about 7 miles from Tyne dock.