I don't usually email my T late (after 10pm), but based on the time I email, I kind of know when to expect a response. I did email once on a Saturday evening and was not expecting a reply until mid-Monday morning, but I got one a couple of hours later. I personally don't expect people, T, others at work, etc., to reply to a work email during their vacation, on the weekends, etc., but I feel that if they do read & reply, they are interrupting their time, not you interrupting it.