This quest has been changed considerably; previously, there was a chance for the time limit to be a problem for lower level characters, as much because of the target location at the Mines west of Archosaur, as to the number of creatures, and the number of each one required.
The primary difficulty with this quest is avoiding the Elder Tortoise, easy enough once you know of it. The target of another quest of the same level, it is nonetheless an all too efficient killing machine, with over 2,000 Physical Attack
The reward is a Condensed Rejuvenation Potion, still very tasty, no matter how outclassed it may look next to the magnificent Mantou pair from Beautiful Chang's level 34 quest,