Time frame is most important in Technical Analysis. You can use 1 hour, 4 Hour, 1 day time frame if you're looking for long term Investment. In case you're an Intraday trader, Scalp trader or Quotex trader, then you can use 1 min, 5 min time frame too. For more details in the forex time frame and forex trading, listen to this podcast & follow- Forex Monk on YouTube.