Musannaf Ibn Abi Shaybah 3045 — How long one sits after the first two

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.