Is it necessary for me to attend all three nights of laylat al-Qadr to achieve the big reward mentioned in the holy Quran?
What if I only attend one night?
And what if I decide to attend for only two hours?

And what tells us that the program provided for us on those three nights are sufficient to acheive the reward?

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It’s not necessary to attend all 3 nights, but if you do, you’ll get a greater reward. If you can attend only 1 night then attend the night of the 23rd it’s the most important one.

And yes you can attend for 2 hours only. When you go back home, try to continue worshipping Allah. You only get this chance once a year, so make the best of it by repenting, supplicating, reading Qur’an, and reading Dua Jawashan al-Kabir.