How long does it take Columbus to convince Ferdinand and Isabella to finance his voyage?

It took Christopher Columbus about six years to secure funding from King Ferdinand and Queen Isabella of Spain for his voyage. He first presented his proposal in 1486, but it was not until 1492, after persistent advocacy and various delays, that they finally agreed to finance his expedition. Their approval was influenced by a combination of Columbus's persistence, the potential for new trade routes, and the desire to spread Christianity.