You joined 8 years ago and now are asking such a question?Which timeframe do you use to for support and resistance or which is the best to use when actually making a trade? Thanks
why time? time is poisonous to price movement.
This Q has been asked a billion times.
It depends on the product and market condition/situation.
For day traders,
Sometimes, you use 0.5 second timeframe,
sometimes, 1 sec ....
sometimes, 15 minutes.
There is no one-size-fits-all thing.
But professional writers will say
don't use a short timeframe chart.
TO EACH HIS OWN.