How can I ask why this European university booked me a 15-day trip for a 2-day exam?
This does seem strange; I'd be concerned about a mistake (though I'm not familiar with the European system). I'd send a concise note like this:


  I'm looking forward to this trip. Could I ask about the itinerary? In particular, can you confirm that my visit will require 15 days (31 March - 14 April), but the 2 exams will be only one day each? Thanks! --Nana