When W said that she didn't want to disrupt the kids routine of showering at night, I just had to point out that she had already been the cause of a much bigger disruption in their lives by having them now live in 2 different homes.
I like my more relaxing time with the kids now on the weekend. When W lived with us, it was always a hurry up and lets get out of the house to go shopping or get an early seat to eat lunch somewhere. She is the type where when I drove into a parking lot, she had to get out and rush to a door of a restaurant to get ahead of anyone else that might be currently in the process of parking. I never understood the hurry or the rigid routines, but I tolerated it.