I think that the real question you should be asking yourself is : What time frame to trade and where to place stop loss and set targets. Without answers to these questions you will not close loosing trades and you will be closing profitable trade very early.
I think that as long as a trade did not touch its stop loss or take profit levels then it should stay opened. Remember, trading big time frames require keeping a trade opened from several hours to several days .
As you are a beginner, i advice you never to risk more then 1% on the overall positions you have in the market.
Good luck and safe trade.