In an employment interview in most places, it would be an illegal question. Assuming you think this is the intent behind it, "how much time can you commit to w

In an employment interview in most places, it would be an illegal question. Assuming you think this is the intent behind it, "how much time can you commit to working on this?" or "you need to be immediately available at all times - can you do that?" would be a better way to phrase it. From the perspective of working, it doesn't matter what the thing is that is placing external demands on your time, only what those demands are.