I think the timeframe depends on the person on what they find effective. I can't imagine trading off charts that are just a handful or seconds per candle but some people are successful. I've found the 15 min for day trading MES to be better for me because it's slower, and I don't get as chopped up as on a 3-5 min. Obviously depending on what you use as a trigger, you won't get as many on the higher timeframe, then a 1-3 min.

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