When is it too little?

I've always thought that I wanted to know exactly when I'm going to die, that way I could prepare and enjoy what I've got here. But now that I'm faced with knowing when someone I love is going to die I'm not so sure. I was told about a week ago that my aunt with a brain tumor has finally decided that she's done treating it, so she only has about six months left. It's hard because we're now all preparing, and it feels like we're going to miss out on the time she has left. We're so busy getting ready for her to be gone so we're not even enjoying that she's still here. Now I'm not sure if I want to know when I'm going to die. Will I be upset because it's not long enough? Will it be soon? I just don't even want to know anymore.