Marathon Training Schedule - Longest of the Long

Through the Houston Marathon Registration I purchased a training plan from Focus n Fly.  So far I like it and feel like it's appropriate.  This week there was some kind of glitch and I had to recalculate the rest of my schedule.  Now it has our longest long run scheduled for December 24th, 22 miles.  Total suck fest.  Not only is that a very busy day, but we will probably be arriving in Orlando after a 20+ hour drive.  Sooooo... we'll have to figure out an alternative plan.  Luckily I have some time to plan for this.