Okay, just read the description on Allearsnet.com and this is what I found.
1. You "swipe" your ticket or pass at either the innoventions site or the Bridge at world showcase site. You get a return time on your ticket to pick up your Kimmunicator (a cell that feeds you clues) and it tells you which country you are exploring on your adventure. The adventures take about 20 minutes or so to do.
2. It doesn't send you around world showcase, just to one particular country per adventure. A team of 4 should use 2 kimmunicators so everyone doesn not have to look over each other's shoulders.
3. You can go on more than one mission if you want but you have to turn your kimmunicators in at the end of each mission and pick up new ones for the next mission.
Hope this helps with the planning. . .also, the adventures go on until 8:30 p.m., 30 minutes before the start of illuminations.