Originally Posted by Cyclebum

This will all sort itself out in good time, of which there is plenty.

The daily mileage has to be left up to her, with a little bit of coaching from you. Just a little bit. If she becomes motivated to 100+ miles/day, and is physically able, she'll do it. Otherwise, forget it. Won't happen.

As you'll be heading north, the odds of a push from the wind are pretty good. But Texas chip seal will push back and summer heat/humidity will be brutal. I'd do this trip in fall or spring and have a day or two cushion for breakdowns and severe weather surprises.

Why a LHT? You don't need that for a credit card tour. Why not a racer, as this idea is more a race than a tour.