if you look at this
picture
you will see the dome and the GWCC. The lobby of building 'C' of the GWCC is just above the dome and to the left.
It is roughly the shape of a ship. In fact the Titanic ship would fit inside the lobby. It is around 1,000 feet or 1/5 mile long. Just to give you perspective.
To get from the pits to the dome floor will require a minimum travel of probably 0.4 mile. Allow for distance and traffic on the way there.
Because if you are not at the field on time you are out of luck.