Quant analytics: How many samples do you need to make a decent forecast of time series 1 step ahead ?

Quant analytics:  How many samples do you need to make a decent forecast of time series 1 step ahead ? And how many for 3, 6, 12 step ahead? What does it depend on ? Any help appreciated —– There is not, and cannot be, any universal answer because that would depend on the behavior …

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