Day is a noun.
Noun: person, place, thing, idea
Verb: action (physical or mental)
Adverb: describes the verb
Adjective: describes the noun
Hope this helps,
♥A.W.E.S.W.A.N.♥
The correct answer is a noun. The "day" was used as an expression to make a comparison about the how it was slowly his walking. So, the word in italic was referring to the noun.
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