All 3 Uses of

however

in

The Lion, the Witch and the Wardrobe

I should not be at all surprised to find that the other world had a separate time of its own; so that however long you stayed there it would never take up any of our time.
p. 54.1 *

however long = regardless of how

Anyway, she'll be better than that awful Aslan! At least, that was the excuse he made in his own mind for what he was doing. It wasn't a very good excuse, however, for deep down inside him he really knew that the White Witch was bad and cruel.
p. 97.2 *

however = though (used to connect contrasting ideas)

And however the dwarf whipped the poor reindeer the sledge went slower and slower.
p. 128.8

however = regardless of how much

Definitions:

(1) (however as in: However, complications may...)
though (or another expression that connects contrasting ideas)

(Based on idea 1 we might not expect idea 2, but this is a way of saying that even though idea 1 exists, we still have idea 2. Synonyms include in spite of that, despite that, nevertheless, nonetheless, on the other hand, in contrastand but.)
(2) (however as in: However much she tried...)
to whatever degree (regardless of how much; or whatever unspecified amount)
(3) (however as in: However you do it, get it done!)
in whatever way