How long one sits after the first two rakahs

Abu Ubaydah says: My father, Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him), says: The Prophet (peace and blessings be upon him) used to sit after the first two rak'ahs for so short a time, as if he were sitting on a hot stone. I asked him: Until he stood up? He said: Yes, until he stood up.

Tamim bin Salamah says: Sayyiduna Abu Bakr (may Allah be pleased with him) used to sit after two rak'ahs only so long as if he were sitting on a hot stone.

Ibrahim reports from a man that he prayed behind Sayyiduna Abu Bakr (may Allah be pleased with him); after the first two rak'ahs, before standing up, he sat only so long as if he were sitting on embers.

Mughirah says: After praying two rak'ahs, Ibrahim would sit in the tashahhud for as long as it takes to recite the tashahhud unhurriedly, and then stand up.

Sayyiduna Ibn Umar (may Allah be pleased with them both) used to say: The rest in the two rak'ahs has been set only for the tashahhud.

Al-Hasan used to say: After the first two rak'ahs, nothing is to be added to the tashahhud.

Al-Sha'bi said: Whoever adds anything to the tashahhud in the first sitting must perform the prostrations of forgetfulness (sajdat al-sahw).

Sayyidah Aishah (may Allah be pleased with her) said that the Prophet (peace and blessings be upon him) used to recite "At-Tahiyyat" after two rak'ahs.