"Durar" is an intransitive verb which is often translated as "to last", and "cuan" is an adverb which is often translated as "as". Learn more about the difference between "durar" and "cuan" below.
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An intransitive verb is one that does not require a direct object (e.g. The man sneezed.).
1. (to go on)
2. (to continue being usable)