The 45 Minute Shower

The final episode of "Star Wars: The Last Jedi" will be revealed in the coming weeks. Luke, Chewy and Grogoo all take 45 minute showers to get ready for filming. But why does it matter so much? It's like on a desert planet is that when moisture is so rare, is that wise thing to do? They're keeping that secret at this point; you just know the final episode.