As much as possible. And, in as less a patronizing way as possible -- E.g. I absolutely hate being handed a printout of the next six months' worth of cancellations as current T was wont to do but now has thankfully stopped; or, being asked, with a great deal of concern if I will be okay etc.

I don't care about the occasional last-minute notice but would hate it if it were to become the norm.

I have so little time to spare (this weekend feels like a real holiday because it's the first time in a really long while that I'm not working continuously through it) that in order to make it to therapy, I've given up doing other stuff (events, workshops, short travel, other stuff that takes time to prep for before doing etc) that clashes with therapy.

So, I'd be pissed as heck if my therapist knew well in advance but didn't bother telling me for whatever the reason and so, I couldn't schedule other stuff that I'd been putting off in order to make it to therapy.