For me, I think it depends on the time zone that contains the form to the broker. In 1 hour or after hours or maybe more when time as server every day. Easily, you need to try 15 feet or maybe some seeds on the ground, it's time now. 30 traders with sessions should too !! and I find that if you have to trade for the short term then m15 is one of the best time frames you can use but if you have to trade for a long time then you can use it as hourly chart because they give you better trendlines for trading !!