Actually, from God's perspective, he didn't take any time at all. Many young-earthers ask "Why would god 'take' millions of years?" By the same token we could then ask, "Why would he 'take' 6 days?"
An old universe and evolution are two different things. The age of the universe actually figures into powerful evidences for design. In any case, a being outside of time wouldn't 'take' any time, it's only from our time-bound perspective that time passes.
Gerald Schroeder, The Science Of God.