Something is just wrong with design of new adventures... I wasn't lazy to calculate rebuilding time for this guide http://diekampfkatze.at/ATclever02.jpg
Total needed time to rebuild lost army for this adventure is 851805 seconds, which is 236 hours and that is a bit more than 9 days.
If all 3 players share equal burden that lead us to a bit more than 3 days of barracks time each. Do I need to mention that finding two other players that will share loses is so extremely hard, especially when you can't really measure and share loses. I am sure that 99% of all adventures are actually cleared by one person who then just sell loot spots.
Solutions? Make adventures that are shorter/require less loses.
Make barrack buffs like Drill or Overtime more available.