Dow theory only indicates the trend of the market whether the market is in positive or negative side. But the price patterns indicates the characteristic of the market in other words its shows behavior of the market like how faster the price goes up and down and etc.,
Double Top(Bearish)/Bottom(Bullish) – 1 month
Head and Shoulders(Bearish) – 3 month [Inverted – Bullish]
Cup – 1 year
Flag(Bullish) – 3-7 days [Inverted – Bearish]
Triangle – 45(1.5 month) days