It is narrated from Sayyiduna Ibn Mas'ud (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) used to sit between the two rak'ahs as if he were sitting on a hot stone. I asked: Until standing up? He replied: Yes!
Hadith Referenceمسند احمد / مسند المكثرين من الصحابة / 4390
Hadith Gradingحکم دارالسلام:إسناده ضعيف لانقطاعه، أبو عبيدة لم يسمع من ابن مسعود.