In my opinion, Ichimoku works best for visual traders – just like any other indicator, the signals you get on a given chart across different time periods are obviously different. For example, if you are adding Ichimoku on a 30-minute chart, you are more likely to get a vastly different signal than on a daily chart.
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As is always the case, the indicator is automatically calculated based on your system you are using and it updates every time you change the timeframe function. As such, this ultimately comes down to what type of trader you are. If you are a day trader or scalper, then you can use Ichimoku on a shorter timeframe from a 1-minute chart, up to six hours.
Conversely, if you are a longer-term trader such as myself, you can use Ichimoku on the daily or weekly charts. A lot of times it helps if you zoom in and out of charts to get a better understanding of the market sentiment. Do not forget one important rule, and that is to never rely solely on just one indicator when analyzing the markets.