trade exactly how your trading plan tells you trade, whether that is how long you hold trades or how often you trade. That simple advice will serve you well once you have a trading plan. Other traders may find constantly buy and selling drives them nuts, and holding each trade for a bit longer and a potentially larger profit is a better option.
Trading plans are just a guide to us and if we stick into it, will help us to derive a better result. Unfortunately, our plans will subject to change accordingly with the market trend. I really don't think that holding plan will work now and even more profitable cause the market will so unpredictable.
Holding it is not necessary anymore if we want to make money from the market, it only wasting a lot of time without a single cents returns to us.