Well, he had to make his way west and north, since he probably couldn't go straight north from Minas Tirith, for fear of Isengard and Udun's forces cutting him off. I suspect he just travelled slowly and warily to avoid trouble. Their is actually a mileage chart somewhere on the internet (don't have a link) which tells the general distance between important places by road and path.
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"What mortal feels not awe/Nor trembles at our name,
Hearing our fate-appointed power sublime/Fixed by the eternal law.
For old our office, and our fame,"
-Aeschylus, Song of the Furies
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