It was said in Tuhfa Arridawiyah: you should sent blessing to the Prophet (100) one hundred times after the recommended (Nafila) after Magrib prayer, and then you recite the following supplication (70) seventy times.
يَا اَللهُ يَا مُحَمَّدُ يَا عَلِيُّ يَا فَاطِمَةُ يَا حَسَنُ يَا حُسَيْنُ، يَا صَاحِبَ الزَّمَانِ، اَدْرِكْنِيْ يَا صَاحِبَ الزَّمَانِ۔
“O' Allah, O' Muhammad, O' Ali, O' Fatimah, O' Al- Hasan, O' Al-Husein, O' the leader of the time, take me over, O' the leader of the time".