Good question about time. That is correct about a day's length. There certainly is difference in persons' religious take that it must mean a 24-hour day. It is clear to me, however, that each day of creation was not 24 hours long. To some, they take it that a day must mean 24 hours. I do not. The Bible itself testifies to that thought, that a 'day' can mean different periods of distinct time, not a 24-hour time period. As far as absolute knowledge (I'm sure you didn't mean to insult me, right?), only the Almighty has absolute knowledge along with his Son. Humans, gorillas, bonobos, etc., do not.
Have a nice day, I hope the weather is good where you're at.