How long did Gatsby wait for Daisy?in terms of years

In the book, Nick Carraway puts together that the last time Gatsby saw Daisy was five years before.  In that time, Gatsby spent his life learning how to amass money, purchasing his huge home across the bay from Daisy's, and thinking of ways to impress her so that she would leave Tom Buchanan, her present husband and run away with him, Jay Gatsby.  Of course, when Daisy learns how the wealth was amassed, she can not allow herself to love Gatsby...his money is dirty and although she doesn't love Tom like she loves Gatsby, at least Tom has earned his money in a clean, honest occupation.