Mishkat al-Masabih 1302
As-Sa’ib b. Yazid said:
'Umar ordered Ubayy b. Ka'b and Tamim ad-Dari to lead the people in eleven rak'as during the night in Ramadan. The reader was reciting [a sura with over] a hundred verses in each rak'a so that we leaned on our sticks because of standing so long, and we did not depart till the dawn was beginning to break. 

Malik transmitted it.
وَعَن السَّائِب بن يزِيد قَالَ: أَمَرَ عُمَرُ أُبَيَّ بْنَ كَعْبٍ وَتَمِيمًا الدَّارِيَّ أَنْ يَقُومَا لِلنَّاسِ فِي رَمَضَانَ بِإِحْدَى عَشْرَةَ رَكْعَةً فَكَانَ الْقَارِئُ يَقْرَأُ بِالْمِئِينَ حَتَّى كُنَّا نَعْتَمِدُ عَلَى الْعَصَا مِنْ طُولِ الْقِيَامِ فَمَا كُنَّا نَنْصَرِفُ إِلَّا فِي فُرُوعِ الْفَجْرِ. رَوَاهُ مَالك