Am I correct in that you can give 3 talaq baains in one sitting and it will be considered as 1?
بسم الله الرحمن الرحيم
In the name of Allah, the Most Gracious, the Most Merciful
Allah (swt) mentions in the Quran, “Divorce is twice, thereafter either retaining her honourably or releasing her kindly… If he divorces her (the third time), she will not be lawful for him unless she marries another husband (and he also divorces her).”
Therefore, to give 3 talaq bains in one sitting will be considered as 3 talaaqs, as mentioned in the book Al-Fatawa Al-Hindiya.
Only Allah knows best
Written by Maulana Mohammed Kamran Abid
Checked and approved by Mufti Mohammed Tosir Miah
Darul Ifta Birmingham
 Surah al-Baqarah, verse 229-230
 Al-Fatawa Al-Hindiya, vol. 1, pg. 355, Darul Fikr