Why use an already existing term to describe something completely different? A day for anyone on earth, is 24 hours.
You mean that it's not a 'day'. Again, a day is 24h, unless you're on another planet.
Like in Peter: "But do not forget this one thing, dear friends: With the Lord a day is like a thousand years, and a thousand years are like a day. The Lord is not slow in keeping his promise, as some understand slowness." <That is in the new testament concerning "the return", so it might not mean that 1 day = 1,000 years in genesis. I'm just pointing out that a day probably doesn't = 24 hours in genesis.
So in genesis 1 it says God created "man"... Both male and female. Then in genesis 2 it says God completed his work by the seventh day, and blesses the day and rests for the day. After this it says, "These are the generations of the heavens and of the earth when they were created, in the day that the 'Lord God' made the earth and the heavens"..