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It's not that I find one or more time frames effective, generally. I just use them for different purposes (and sometimes not for the right ones).

Dailies are my go-to when I'm reviewing something for the first time and/or just thinking of my long term plan. 4HRs is where I plan my entries, I will then check out 2HRs to see if I'm missing anything (like that bearish divergence I just mentioned).