Yes, I trade on 15-minute interval expiry times -- e.g., 5:00, 5:15, 5:30, 5:45. That means I'm in a trade for between 5-20 minutes. For example, if you take a trade at 5:27, you're already locked out of the 5:30 expiry, so you must go for the next 15-minute interval (5:45 expiry), leaving you in a trade for 18 minutes of…