I use the same with you. I'm using an open position in TF15.
Because I think in TF5 I encounter many open errors, for TF1H.
To see price movements in long trends. to make sure we are not upside down in open positions, TF4H is too long in my opinion and TF4H is often used by long-term traders, because TF4H is basically the result of weekly trading profits.