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i dont know how long the walk will take, how long has it taken others..... Maybe I'm misunderstanding by taking it too literally, thinking you will actually walk the whole way. Lets see, at 3000 or so miles across the US, at maybe 3-4 miles an hour, which is very brisk walk, we're talking about 1000 hours or more of walking. Let's say 1200 for good measure. Dividied by 10 hours a day, every day, that's 120 days. No allowances for weather, storms, blisters....... To do it in 30 days, you'd have to walk 100 miles a day. And that is assuming a very straight line route, like the freeways... I don't think that is possible.... How much walking do you do now? You can't go from nothing to even 5 miles a day without it hurting, it takes time even to get to that amount of regular walking each day.... It doesn't sound like you've researched much about what is involved in this, you should try to find out more about the realities of it.... Sorry, don't mean to discourage you, just asking you to take a realistic look at what you are talking about doing..... Try walking just from one side of your county to the other, and back, and see how you do with that.
Here is someone who took about a year to do the walk, notice starting out he only did 5-10 miles a day at best:
http://www.thefatmanwalking.com/page/85415/index.v3page;jsessionid=9028rpsb84a61
A book about such an experience, 5 years to complete: http://www.peterjenkins.com/books_profile_AWAA.htm
Several who have done this, taking 6-9 months: http://www.43things.com/things/view/10816/walk-across-america