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A general rule of thumb in home networking says that WiFi routers operating on the traditional 2.4 GHz band reach up to 150 feet (46 m) indoors and 300 feet (92 m) outdoors. Older 802.11a routers that ran on 5 GHz bands reached approximately one-third of these distances.
The official Wi-Fi direct site (see under the point How far does a Wi-Fi Direct connection travel?) states that the maximum range of WiFi-direct is up to 200 meters (which is 656 feet), but I highly doubt that phones already achieve this range...