"Ez egy hosszú hét."
Translation:This is a long week.
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"last week" is not just a noun phrase like "December" -- it's also an adverbial specifying when something happened like "in December". You could think of it as "during the last week". (My friend visited me last week = My friend visited me during the last week.)
The -en ending in héten serves the same purpose as the "during" part of "during the last week".