Yes, but it doesn't say how long a day was. And it also says we were made from clay. This could be a metaphor for the primodial ooze from which we came...
The Bible describes a day as light to dark and to light again. At work so don't have the direct passage, but the Bible is clear on what a day and it is used in all forms of contexts. After 3 days, Jesus ascended into Heaven, Moses' flood was 40 days and nights, etc..... I don't believe there are any metaphors in Genesis, but that's my humble opinion.