Just to clarify, the only sentient being in the first few days of creation was God. If you agree He views a thousand years as a day, and He was the only one observing at the time, then we’re not necessarily limited to 24-hour days.
Red Sea parting? 40 years in desert with Manna? Jericho? Walking on water? Healing the blind? Must all the miraculous go? What about the resurrection? That is impossible according to common observation and modern biology.