The mission team estimates Opportunity may be able to travel about 100m per day.
But even at that pace, the journey could take two years. The rover will stop to study rocks on the way, and in winter months it cannot move because there is not enough sunlight to provide sufficient power for driving.
Wow. Like the viking landers, these guys have performed way beyond expectations. This is the kind of thing that makes you proud to be part of the human race.