Looking at that route, I definitely wouldn't do it that way then. That leaves a pretty long drive of about 211 miles between Grand Island and Valentine, and that's why it's showing up with such a long recharging time. It's needing to go much nearer to full state of charge, which makes the charging speed slow down a lot. For Tesla traveling, frequently what makes it more convenient and less worry is to break it down into shorter segments hopping between Superchargers, even if the total route distance is a little longer.
So what I see as the route I would take is to go from Lincoln to Grand Island Supercharger and then on to Gothenburg Supercharger. Those will both be quicker charge stops. Then that leaves the route up from Gothenburg to Valentine as 157 miles. That's much easier than trying to make the 211 mile segment.