STL Depreciation Method - Is there a limit to Number of Years Populated in Field

Hi

I was  testing putting a life over a 1000 years against a new Depreciation Method, and was trying to use 7777.00 years instead of our current longest life of 777.00. I wasn't able to do this, so am I correct in assuming that there is a limit in the years' box on the Depreciaiton Method set up form.

Thanks