Don't ask when we're hoping to finish. Research is not a course, it's a job. It's like asking, "when is your start-up's IPO?"; it makes a lot of assumptions and implies your career is a paint-by-numbers affair.
Don't even talk to us if we seem like the kind of kvetchy grad-student who bitches about having no free time. Maybe it's just that I'm at Technion instead of some American university where everyone's a careerist workaholic, but over here many grad-students do have lives, at least until we actually get into doing our thesis. We know there are no new professorships, without illusions, so we're a little less hasty to finish.