# Is it normal for Calc goal seek to take very long? [closed]

I made a spreadsheet for a 30 year loan, 360 months, with a constant payment, and asked goal seek to calculate the interest rate to make it pay off at .6% of original principal a month, calculating interest by the dollars*days for a 365.25 day year. The starting value of 6% per year was almost correct. The goal seek did not have an answer even after several minutes. Does Goal Seek make too many wild guesses?