Mubham: dahr, ḥīn — duration is not bounded by the word itself.
Maḥdūd: yawm, layla, shahr, sana — recognized units of time.
“Delimited” does not mean a known calendar date: yawman may be an unspecified day, yet “day” remains a bounded unit.
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Comparing Time Types
Al-Mafʿūl Fīhi: Adverbials of Time and Place
Mubham: dahr, ḥīn — duration is not bounded by the word itself.
Maḥdūd: yawm, layla, shahr, sana — recognized units of time.
“Delimited” does not mean a known calendar date: yawman may be an unspecified day, yet “day” remains a bounded unit.