The bible is a clear about a lot of things that are utter nonsense, I wouldn't use it as a guide for anything related to things like measurements of anything.

And a day is a day, no matter how you try to spin it after a couple of thousand years of peddling nonsense to try to make the gravytrain go a little farther.

This is no different than the Jehova's witnesses changing their 'due date' whenever it doesn't work.