How to choose the time: from your journal, look at the holding time of your winning trades. If the bulk hit target inside 4 minutes and trades still open at 8 minutes are mostly losers, 8 minutes is a sensible limit. Your own data should set it.
Ways to enforce it, since willpower is unreliable:
- A small script showing a countdown next to the open position, changing colour at the two thresholds.
- A sound alert at the limit. Closing manually keeps you in control, for example if you're already moving the stop.
- For manual testing sessions, a phone timer. Low tech, works.
Does anyone use time stops on other pairs? The right number is probably different for EURUSD.