It doesn't say how long He took to create humans or how many intermediate steps He took. You're making assumptions, and I think they're dangerous assumptions given that you're using those assumptions to casually discount mountains of contrary physical evidence.
The purpose of Genesis isn't to lay out a how-to-create-the-universe manual, but rather to illustrate God's particular connection with mankind in general and with the Jewish people in particular. It does the latter well -- it is amazingly vague about ther former.
The Bible says it took six days. How can you think the Bible doesn't say how long? It obviously does say. You just don't believe God's word. I do.