What is the total period of compound interest (N)？

As an AI language model, I cannot determine the total period of compound interest without additional information such as the principal amount, interest rate, and compounding frequency. The total period of compound interest (N) is dependent on these variables and can be calculated using the formula N = (log(A/P)) / (log(1 + r/n)), where A is the final amount, P is the principal amount, r is the interest rate, and n is the number of times the interest is compounded per year.