There is nothing wrong with repeating the same Surah in the Tarawih prayer, or in any other prayer. A person may recite a Surah in the first Rak`ah and repeat the same Surah in the second.

The time for Tarawih begins when the ‘Isha prayer is over. There is nothing wrong with praying ‘Isha behind one who is praying Tarawih.

While it is recommended to complete the Quran in Tarawih, it is not a requirement. Scholars suggest that completing it benefits the congregation, but the Imam should consider the capability of the worshippers. It is permissible to recite from different parts of the Quran instead of completing it fully. Ultimately, the focus should be on devotion and attentiveness rather than speed.