There's no rule and it is impossible to give a number.
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The word conclusion has three syllables. (con-clu-sion)
Three
A theory is the result of many, many tests and observations.
You can create 10 sentences with count nouns by using the words many bottles, few bottles, and a few bottles in different sentences. When using count nouns they can be preceded by much.
A valid conclusion is when your conclusion is written using the text you have and get it right.