Strictly speaking, the league is an historic measure of the distance a person on foot could travel in one hour. In modern parlance it equates to approximately three-and-a-half miles, or five-and-a-half kilometers. At sea, one league is generally understood to be three miles. At a comfortable walking pace, an average unencumbered player character can traverse approximately three zones in one in-game hour, leaving me to judge each zone as roughly approximating one mile. That, however, is a very rough estimate and can vary from one zone to another. In particular Talenghard Hill is drawn on a different scale to the rest of the map, as are most interior areas.

For the purposes of judging distances in this event, the distance hustled was approximately eight miles: two-and-a-half miles west, two miles south, and three-and-a-half miles east/northeast. I agree with DarnPiper's use of the hustle rules in this situation, and consider the distance covered to be within reasonable limits particularly given the situation and the magical enhancements which applied to much of the party.

Do not meddle in the affairs of dragons, because you are crunchy and taste good with ketchup.