How many times should I perform an experiment to get a high level of accuracy?

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I have an experiment with 4 factors (independent variables). The first and second variable have 8 levels, the third 5 and the fourth only 3 levels. Theres one dependent variable. How many times should I perform the experiment in order to get a high level of accuracy? For instance a 95%. I would appreciate the mathematical procedure behind this calculation. Thank you.