See I don't have any trade open for years as I am a junior in this forex business ,I don't think you need to wait for years to earn profits in forex.As far as the question concern you may have permission to do so, but market may change any time once it was 3 times of your initial amount and at the other day it may become a big ZERO.So why wait for months or years.You should close trades as you see satisfactory profits.