Most of these candlestick patterns form over 1-3 days making them short-term patterns that stay valid for 1-2 weeks. But know it that these candlestick patterns are trying to reverse an existing trend, usually a short-term trend that is a few weeks old. The bullish candlestick patterns form in short-term downtrends, while bearish candlestick patterns form in short-term uptrends. Do not hope for a long-term trend reversal from a candlestick pattern.