Yea everyone can believe as they wish. As you probably know the Bible contradicts that theory. At least from the point of view of time.
I do not believe the Bible contradicts any timeline. We do not know how the time of God. The word day in genesis means a defined derived of time and not an earthly day. We cannot hold God to our understanding of time. That is putting too much of mans understanding onto God. I can believe in both a long or short creation. We will know those answers when we are with him but my guess is it won’t matter. Creation timeline is not a salvation requirement, yet we can marvel at the creation.
At the Catholic university I graduated from, the prof of Theology was a Jesuit priest-he was very popular because he answered questions in a sensible, pragmatic matter-when asked about the difference between the Biblical and scientific timelines concerning the Earth and the historical events/records, his answer was “God is the Supreme Being-the Creator and architect of all things-who knows the length of a day in the Eye of God?”