The candles can represent different amounts of time depending on what settings you have picked. Commonly available candle sizes are 1 minute, 5 minutes, 15 minutes, 30 minutes, 1 hour, 6 hour, 12 hour, 1 day, 3 day, 1 week, 1 month.

Daily candles usually go from midnight to midnight. In most charts, if you hover over a candle, there will be display somewhere on the chart that tells you the timespan of the candle.