Here is the scenario. My sister ran Chicago, 26.2, on Sunday. She calls me up to ask if I would be interested in running a half on Halloween weekend. My longest run to date has been six miles. I've been running consistently four days a week with runs in the four and five mile range on those days. Would it be possible, using run/walk, to accomplish this in the three hour time limit? Or would you say no, due to lack of distance training?