It turns out that there was really not much point to making a schedule. Kas and Helen visit the witch clan whenever Helen feels like it, and stay as long as she wants, and go when she wants to be somewhere else, and it all adds up to plenty more time spent with the clan than away.
After the aquarium jaunt with Ranata, it's a little more than a month before they visit the clan again.
"He wants me to learn -" Shura gestures. "Mortal stuff. I don't have to go to school but I have to listen to him tell me stuff that I'd get told if I went."