how long to study the signals of a instrument?

Hi at all,

After we develop basic of a strument, for to detect and analize
the signals, how long to study it on historical data ? or on real data?
1 month ? 1 year ? 3 years ? ...more?

I think the correct study period is relative to period we want use this strument,
for example: if we want develop a profitable strument to use for 1 year,
we must study and analize results of this strument, at least,
on 1 year of historical data.

So, how long you analize results of a strument? and for how long you want use it ?

Thanks everyone in advance

Moving averages (especially EMA), MACD, and ADX are widely used for trend following. Combine them to confirm trend strength and direction. Don’t rely on one indicator alone. Price action and volume analysis also help confirm signals.

Its a wasted effort, historical data offers little benefit it producing future profitable strategies that work forward.
It’s better to trade random systems with no edge and use money making strategies to produce a likely profitable outcome.
ie. If you chase 15R, you only need to win less than 20% on your entry’s.
Also note the historical data is manipulated just a small bit to make most testing data worthless.

There ae no "signals." If there were, there would be at least a few million traders who already beat you to them.