My ex T seemed to take about three weeks off per year, perhaps 4, but sometimes he made a point of saying he'd still be available by email or phone during his time off.

I'm glad your T's schedule doesn't bother you much. It does seem odd for a therapist, as breaks are often very difficult for clients, but I suppose it depends on the type of therapy & clients. I think that if a T is taking off more than -- I don't know, 5-6 weeks a year maybe? -- I would expect to be told that up front in the first meeting.