Many power plants can last much longer than the $20-30$ years assumed in most LCOE calculations, often $50$ years or more. This affects the LCOE estimates for solar farms, where almost the entire LCOE is from capital costs that are multiplied by the CCF$.$

How much lower is the CCF for an $9\%$ loan over a $50$ year period compared to the same loan over a $20$ year period?

For example, if the $50$ year period has a CCF of $\mathrm{.}06$ and the $20$ year period has a CCF of $\mathrm{.}1,$ you$$d answer $40\%.$