64.5 hours and 8min.
This is such a vague question and impossible to answer.
What kind of site are we talking?
Is the website's topic something you know about or do you have to do research on it?
Does the content need to be written or is the content already available and just needs to be optimised?
Will there be dynamic content?
Will there be a blog?
Will there be eCommerce functionality?
Will there be user management?
CMS? If yes, custom or off-the-shelf?
Do you know how to work with that specific CMS or do you have to learn it first?
Multimedia content such as video?
What about skill set?
Are you a fast worker? Slow worker?
... and so on and so forth.
It just isn't possible to give a sensible answer to your question and any attempt at doing so without knowing the specifics seems utterly absurd to me.