I have experimented for a long time with different timeframes until I understood a simple truth: the choice of the time interval for the RSI indicator depends solely on how you trade. There is no magic answer that works for everyone.

If you are a day trader or a scalper, your world is fast trades and short-term fluctuations. Here I look at 15-minute charts, sometimes 5-minute charts. RSI on these intervals is very sensitive, catching every price movement. The downside is that there is a lot of noise, and false signals will be plenty if you don't filter them with additional tools. Tip: if you decide to work on minute charts, you need experience and clear entry-exit rules.

For swing trading, I prefer hourly or 4-hour charts. Here, the picture is more stable. RSI on these timeframes shows short-term trends and pullbacks that you can hold for several days. The daily chart is a different level. Trades can last weeks, and signals are more significant and reliable.

For long-term investments, I look at weekly and monthly charts. Here, this indicator works to identify global overbought and oversold zones. Signals are rare, but when they appear — it's serious.

Key points I consider: how long I usually hold a trade, what I need to find — an entry point for the day or the overall trend for months. The smaller the timeframe, the more noise. On larger intervals, market noise is smoothed out, and RSI works cleaner.

My proven advice: don't get stuck on one timeframe. I often look at the daily chart to understand the overall direction, then switch to the 15-minute chart to find the exact entry in this direction. This is called multi-timeframe analysis, and it works. Start with what matches your style, experiment, and you'll find your optimal settings. Each asset may require its own approach.