I've always been taught and understood the Genesis account of creation to be a literal 6 days with God resting on the 7th day. This is supported by the following that comes to mind:
1) Reference to the word 'day'
2) There are references to morning and evening (suggesting 'day' is not figurative)
3) There are 7 days in a week and God rested on the 7th day (there is contextual consistency)
4) The 4th commandment, "Remember the Sabbath day, to keep it holy." How would the people of God know when this is if it were anything other than a literal day?
5) John 1:1-3 "In the beginning was the Word, and the Word was with God, and the Word was God. 2 He was in the beginning with God. 3 All things were made through him, and without him was not any thing made that was made." Now, when Jesus brought the dead girl back to Life in Luke 8, it is said in verses 52-54, "52 And all were weeping and mourning for her, but he said, “Do not weep, for she is not dead but sleeping.” 53 And they laughed at him, knowing that she was dead. 54 But taking her by the hand he called, saying, “Child, arise.” 55 And her spirit returned, and she got up at once." When did the girl get up? At once, not some indeterminate period of time. Likewise, how long did it take for the winds of the storm to die down when Jesus and His disciples were out on the sea? When Jesus speaks, his command is fulfilled immediately. So when the universe and all that is described in the Genesis account was created, it is very possible, very reasonable, AND is consistent with the rest of scripture.