I would expect 5 years or so, yes. That's just the construction industry, he's got a lot of money, but you don't want to rush these things.
How is it "clear that commercial transformation will only take place post-stadium build"? I would say that the ongoing works to improve the look of Goodison park are happening in an attempt to improve the image of the club, therefore increasing the commercial income potential. That is happening now. There are deals currently in place that will restrict the forward movements we can make on some commercial income, such as shirt sponsorship, shirt manufacturer deals etc, but he'll be able to do something about Chang next summer, and he mentioned specifically the shirt manufacturer deals done by other clubs so improvement in that area that is clearly an aim of his.