I am guessing your definition of Early Man isn't the same as mine, but be that as it may, time is time. I can't see how time for some, goes faster than time for others.
RB's question, that I tried to give an opinion on, was about God's time. I believe the time when we are with God, is not time as we know it, and the Bible uses the "1000 years is a day" exaggeration to make that point.
Way I looked at, time before the creation of, or the earth taking form and developing cycles, if you will. It coming onto a separate night, that was dark and day, that was light. That time was described as days, being periods of time that things happened. In the Biblical account and a few other early writings.
You can't justify a 24 hr day, 365 day year as being a day, till day and night was created, or came into existence.
Even then who is to say that writings referring to the creation scedual, did not follow suits and refer to periods of time as days? After all, it was written for a simple people to understand and was passed on by oral tradition before that.
I can not go further into this without breaking the religious rules of the forum. Because then I would start discussing deep religious beliefs.
I am in no way here giving an opinion as to my religious beliefs, but just stating observation I have made between many beliefs and theories.
@Brad if I have gone to far please remove or edit