1. The problem is to determine the number of years, given the options 5 or 6. 2. Since the user states "NUMBER OF YEARS IS 5, NO 6?", we interpret this as a confirmation question about whether the number of years is 5 instead of 6. 3. There is no mathematical formula needed here as this is a direct question about a value. 4. The answer is that the number of years is 5, not 6, based on the user's statement. 5. Therefore, the final answer is 5 years.