Network.GetAveragePing
static function GetAveragePing(player: NetworkPlayer): int;
Description

The last average ping time to the given player in milliseconds.

If the player can't be found -1 will be returned. Pings are automatically sent out every couple of seconds.
	function OnGUI() {
		GUILayout.Label("Player ping values");
		for (var i : int = 0; i < Network.connections.Length; i++) {
			GUILayout.Label("Player " + 
				Network.connections[i] + " - " + 
				Network.GetAveragePing(Network.connections[i]) + " ms");
		}
	}