The Citadel is an archive of information for George R.R. Martin's A Song of Ice and Fire.
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[How big is Westeros? Is it the size of Europe, or even larger?]
I have deliberately tried to be vague about such things, so I don't have obsessive fans with rulers measuring distances on the map and telling me Ned couldn't get from X to Y in the time I say he did.
However, if you really must know, you can figure out the distances for yourself. The Wall is a hundred leagues long. A league is three miles. Go from there.
But if you turn up any mistakes in travel times by using that measure, let it be your secret.
The Westeros network consists of several different sites, including a forum and a wiki, for all your A Song of Ice and Fire needs.