My T works Monday, Tuesday, Thursday, although she's come in on Wednesdays a couple of times to join in with a meeting at my school or a meeting with me, my parents, family T and pdoc. And she offers 24/7 out-of-session contact.
She checks her email on working days and on Sunday evenings, but she once told me when I wasn't doing well she'd check her email every day that week in case I needed email support.