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How reliable is a system in the long term?(BACKTESTING)

Again, apologies for the English, clearly I use a translator.

I start this topic because I’ve seen Darwins who start out very well for 1 or 2 years and then fall off and disappear out of nowhere.

How long or/and how many operations should a backtesting have?
10 years? 5 years? 20 years?
100 op? 1000 op?

Then if you backtest for 8 years and end up positive every 8 years, is it a reliable strategy? Or was it just a strategy that worked for those 8 years that passed and it won’t work for the future?

I’m touching on this subject because I read something the fellow wrote @CavaliereVerde
And so that doubt has come to me.

Translated with www.DeepL.com/Translator

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