No, that is not decisive in stating that literal days are meant--only that in mimicking the Creation people apply that to *their days" literally. The Creation "days" are obviously different, in my thinking. The days observing the "days of Creation" were memorial days, whereas the Creation days were transcendent, not being able to fit into our definition of a literal day.
It's like saying, God performed acts of creation in 6 distinct categories, represented metaphorically by "days." And then God rested afterwards, represented by a single 7th "day."
Do you really think God rested for only a 24 hour day? Israel was to mimic God's creation "days," or categories by observing "days" in His honor, just as we might observe a single holiday to honor the end of a war, which may have taken much longer than a day.
The 7 day week was a "memorial week" observed in honor of God's Creation Week, which was so transcendent that it had to be put in the language of our "days."