When are you going back?

It's nice being home, seeing familiar faces, eating food I don't have to cook myself. But every time I come back, I have to deal with a pet peeve of mine. People always ask me, "When are you going back?"
I know they're not saying it with bad intentions, and they're curious about my stay. But the focus of that question is the going back part. I'm thinking, "I just got here and you're asking me when I'm leaving already? Haha." I think the question can be rephrased to, "How long are you staying?" That way, the focus is on the staying part and it feels more inviting to me.