Well, it’s possible. Genesis says that God created the world in seven days:
And on the seventh day God finished his work that he had done, and he rested on the seventh day from all his work that he had done. So God blessed the seventh day and made it holy, because on it God rested from all his work that he had done in creation. (Genesis 2:2-3)
Elsewhere, it says that the a day with God is as a thousand years:
But do not overlook this one fact, beloved, that with the Lord one day is as a thousand years, and a thousand years as one day. (2 Pet 3:8)
Though actually, when you think about what Peter is saying here, it’s rather more that God is outside the constraints of time. So it’s possible that God created the world in 7000 years, but it’s also possible that it was some other time length. Even possibly 7 days.
However the real interest in the idea that the literal 7 days are a longer time period is because the world looks a lot older than that. There’s a variety of ways to resolve this apparent dilemma, but the idea that the creation was spread out over time isn’t one of them – the Genesis record is very specific about what things were created on what days, and it just doesn’t align.
For further information, see related posts.