Stop loss is the one setting with which we can peacefully go away from our trading terminal for other work that our account will be still safe if anything happens in market that is unpredictable and market runs opposite to our position. This is something like a protective gear like Helmet we wear during riding a two wheeler. Nobody can say anything for sure what will happen next in the forex market.. So actually you cant say anything with surety.. because this is the most uncertain market of all.. anything can happen and anytime.. this is why you need to ready for everything.. to protect your account there is no tool better than stop-loss in your trading..