Sorry, this is incorrect.
The correct answer is : 30+10
Ref: Surah A-A’raf 7:142
Arabic:-
وَوَٰعَدْنَا مُوسَىٰ ثَلَـٰثِينَ لَيْلَةًۭ وَأَتْمَمْنَـٰهَا بِعَشْرٍۢ فَتَمَّ مِيقَـٰتُ رَبِّهِۦٓ أَرْبَعِينَ لَيْلَةًۭ ۚ وَقَالَ مُوسَىٰ لِأَخِيهِ هَـٰرُونَ ٱخْلُفْنِى فِى قَوْمِى وَأَصْلِحْ وَلَا تَتَّبِعْ سَبِيلَ ٱلْمُفْسِدِينَ ١٤٢
Translation:
We appointed for Moses thirty nights then added another ten—completing his Lord’s term of forty nights. Moses commanded his brother Aaron, “Take my place among my people, do what is right, and do not follow the way of the corruptors.”
Tafseer / Explanation:
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Allah appointed forty nights for Prophet Musa (Moses) to meet Him and receive divine guidance.
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Before leaving, Musa instructed his brother Harun (Aaron) to lead and guide the people.
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The verse highlights Musa’s devotion and the significance of his direct communication with Allah.
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It also shows the trust and responsibility given to Harun in Musa’s absence.
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This event sets the stage for the revelation of the Torah and a major spiritual moment in Bani Israel’s history.