It might not seem important but defining which holding period you are following or trading on before you place a trade is very significant. Long term trades may be based on technical analysis, fundamental analysis or a mix of both; they will also need large stop losses and should aim for larger profit limits. Short term trades will only be based on technicals as it is not actually concerned with the underlying trend and need much smaller stops, but take a lot more time as you have to be constantly on top of the market. Your holding period defines what profit or losses you can expect from a trade and need to be addressed beforehand.
You may even want to split your trading capital into two parts, one for short term and one for long term trades. This gives the opportunity to diversify risk and even take short term views and medium term views on the same market.