Wow, I totally should have bought those knees pads at the store next to all of the tile supplies.... After 8 hours of tiling, the knees could have used them.
I started at 8:30 this morning with a goal to make as much progress as possible on the shower walls. I started with one row remaining on the back wall. Below is my time lapse for the day:
By 10:30 I had a good jump on the second wall.
By 1:30 I was getting close to two walls done.
At 2:30 I finished wall number 2!
I hammered out another 3 hours downstairs and managed to get a great jump on the final wall.