PDURATION(rate, pv, fv)
=PDURATION(C5/C6,C7,C8)
The PDURATION function can be used to calculate the number of periods it takes for an investment to reach a certain amount of money. For example, this will return 166.70 periods if the interest is compounded monthly.
The PDURATION function is a financial function that calculates the amount of periods required to reach a specified future value, based on a given rate and present value.