قَرَأْتُ كِتَابًا — kitāban is the direct object: what was read?
قَرَأْتُ لَيْلَةً — laylatan is a time adverbial: when was it read?
Identical accusative endings do not mean identical functions. These are added teaching examples.
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Adverbial versus Direct Object
Al-Mafʿūl Fīhi: Adverbials of Time and Place
قَرَأْتُ كِتَابًا — kitāban is the direct object: what was read?
قَرَأْتُ لَيْلَةً — laylatan is a time adverbial: when was it read?
Identical accusative endings do not mean identical functions. These are added teaching examples.