This tutorial video may help give a better idea of the effort required to do a run animation:
Keep in mind that the art needs to be properly prepared to make rigging so easy. The video skips the boring posing for all the frames, so don't get the idea that it's a 15 minute job. 🙂 Also, the run animation looks ok at the end of the video, but would need additional work for secondary motion and refining the movements before considering it done. It likely takes a few hours at best.