Don't ya just love how many people are ready to say "It can't be done!" Kudos for having a real stretch goal on speed/distance/schedule. It's not for every one, especially those that like to smell the roses and do some bird watching along the way but obviously you've done the ride before and know what's ahead of you. Somewhere up there in this thread you said something like "did it in 20 days on a less capable bike." What'd you mean by that? What "more capable" are you riding/doing this time that will chop 40% of the time off your trip? We rode the TAT from Andrews NC to Port Orford in 2015 and it took 20 days of haulin' ass, riding long days, camping (no searching for places to sleep), AND skipping big sections of what we called "gratuitous gravel" like, oh, the entire TAT track through the state of Oklahoma. So, I'm personally going to be really cheering for you and definitely think you ought to give it your best shot. Do I think you can ride coast to coast in 12 days? Absolutely. Do I think you can do it riding nearly all of the TAT? LOL, I guess we'll see!