Alright, so I'm going to try to get a little summary from what you guys are saying :

First off crossing from west to east in a month is 100% no.

Now the Western Express would be too hot wouldn't it? Yeah I guess the west coast would be safer and nicer too. I'm thinking like flying in to Seattle and flying out of Los Angeles, which if we follow the coast is about 1400 miles. And yeah we're definitely looking to meet people so the west coast looks like a good idea.
Now yeah I'm American, so I kind of know America, like I've been there a lot, but I've never lived there.

Also overall, people seemed to be advising ~60 miles a day, which would work with the 1400 miles, and we could then probably have some days off or like stay in SF a few days or whatever.

Anyway thanks for everything everybody Big help !
Also I was wondering, what would you advise we do for bikes? Because some of us already have road bikes, so then we could just add something to add bags, but then one of my friends doesn't have a bike, should he buy it in America ?
Or then we could just rent bikes ?

Thanks guys !