There’s no ‘best’ time frame for finding support and resistance levels. Traders can use whichever time frame works best with their trading style and strategies. The same trader might use a four-hour chart for one strategy and a weekly chart for another strategy. In general a long-term trader will use daily to monthly charts, a swing traders could use anything from a 4-hour chart to a weekly chart, a day traders would use time frames from 15-minutes to daily charts, and a scalper would use charts from four-hours down to tick charts that plot every tick in the market.