The hike from the trailhead to the campground and first major waterfall, Havasu Falls, is 10 miles. Supai, with a general store and cafe in addition to the lodge, is 8 miles in.
Article source: http://rssfeeds.usatoday.com/~/617278562/0/usatodaycomtravel-topstories~Getting-into-Havasupai-a-slice-of-heaven/