@sudnadja True, but most things tend to be roughly on the ecliptic. Unless there's a game reason for something to be on an awkward orbit, it won't be.
You also have the magic get out of jail free card of a Jump drive. If it's going to take longer than 7 days, then the Jump drive can be used to get you there quicker.
I do have a plotline coming up that involves an extra-solar object, which might be interesting to have it both fast moving and on an inclined orbit.