No, you are to work six light / dark cycles because God created the universe in six light dark cycles. You have plenty of empirical data to support that your light / dark cycle is approximately 24 hours, but you have no direct or indirect evidence as to the duration of the light / dark cycles of Creation.
You didn’t get this phrasing light/dark cycles from the Bible. You ignore plain reading for made up phrases. I don’t need evidence direct or indirect. I have the scripture which clearly states that there were six days. It would seem that the scriptures go out of the way to make this fact clear by using not only numbers with the word day but also the phrase evening and morning. Again, every other place that the word day is used with evening and morning or with a number it means a literal day. But you are arguing that in this case when it uses BOTH a number and the phrase evening and morning that it only means an unspecified amount of time that has a light/dark cycle.