My wife and I were playing and according to the rules for two people if either has 12 Buildings and/or Adventurers this triggers the game end.
This seemed to go pretty quickly for us. Did I get a lucky draw with 4 buildings that provided extra resources during a build option?
We initially thought it was 12 Buildings AND Adventurers (24 total) to trigger the end.
Just seemed like we were just getting going with buildings (I had 10 and she had 6) when we suddenly were at the end.
Did we miss anything here?
The Monuments expansion fixed the length problem for us and I would never play without it. Monuments generally require more actions than regular buildings to eventually complete, and they don't count toward the building/adventurer end game limit. Someone could still ignore them and try to rush buildings/adventures to trigger the end, but it wouldn't be a great strategy in most cases. Monuments are worth a lot of VPs and there will be some adventures with abilities that reward monument/building construction.