Let's be clear here. We're talking about a "time horizon", not a "timetable". I realize you might be confused, because a table is horizontal. Here's the difference, though: a table is right here, and you can put stuff on it. A horizon is always over there somewhere, which is why you can't put anything on it or bump into it when you go to get a snack in the middle of the night.
Let's say we're out sailing with Iraq, and Iraq says "Hey, just a question: when are these fucking troops leaving?". We now have an answer:
"See that line over there? When we get to that line".
So, let's review: timetable? No. Time horizon? Yes.