Had you considered that several million years IS a nano-second to God?
Yes, and considering the evidence we are led to believe otherwise.
A straightforward reading, and other ancillary data associated with the creation leads us to believe He meant six days as we perceive six days to be.
Gen 1 1 In the beginning God created the heaven and the earth.
2 And the earth was without form, and void; and darkness was upon the face of the deep. And the Spirit of God moved upon the face of the waters.
3 And God said, Let there be light: and there was light.
4 And God saw the light, that it was good: and God divided the light from the darkness.
5 And God called the light Day, and the darkness he called Night. And the evening and the morning were the first day.
Here the text evening and the morning seem to imply time associated with days as we know them. When He created time via light the clock began ticking at that point. We know that there was no sun and moon to delineate evening and morning, but in reality the sun and moon don't cause seconds to pass, they are only a point of reference not the originators of time.
Exo 20:8-11
8 Remember the sabbath day, to keep it holy.
9 Six days shalt thou labour, and do all thy work:
10 But the seventh day is the sabbath of the LORD thy God: in it thou shalt not do any work, thou, nor thy son, nor thy daughter, thy manservant, nor thy maidservant, nor thy cattle, nor thy stranger that is within thy gates:
11 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.
Here is another direct correlation that God makes between the Jewish work week and God's creation week. There are no passages of scripture that float the idea that God used more time to create the universe than six days.