Simple. How long is a day to God?
And how can you presume to know?
Folks who feel threatened by the truth often protest too loudly.
For in six days the LORD made heaven and earth, the sea, and all that in them is, and rested the seventh day: wherefore the LORD blessed the sabbath day, and hallowed it.
Exodus 20:11
If you say a day is longer than a day, why do they not use a different word? the hebrew has more descriptive words than day for long periods of time.