I don't think they need to assemble the wings. The images aren't too detailed, but it seems like the folding wing type similar to what the Americans used on the Grumman Avenger: http://www.cmjstealth.com/more/2004%20EAA%20Arlington%20Fly%20in/page3.htm
I think that fitting the floats would take more time.
I wonder how they handle retrieval though... Land them on the water, then pick them from the drink with a crane, maybe?
This is where the idea for the British carrier sub in the PC game came from.