Hey, thanks! You just need to pass safely through the hexes, you can decide in the fiction exactly when. The hexes are a bit up for interpretation as some are obviously busier and more dangerous than others, just looking at the art. A good rule of thumb is to have on average one challenge/hex, any more and the party spends resources quite fast. If the hex looks completely safe (though this is rare in hieronymous tbh), you can always have a positive encounter or restful moment, and have 2 challenges in a later hex.