Based on your financial expertise, provide your response or viewpoint on the given financial question or topic. The response format is open.

Calculate time to reach investment goals given starting balance?
Fairly straightforward to match the result from the calculator soup link.  There is a formula to calculate n from the future value s (using natural logs) In Excel This was derived as shown  To calculate n from the inflation-adjusted future value si requires using a solver since an algebraic formula cannot be formulated.  As demonstrated  Calculations done using Mathematica 7.