Kaddish D’Rabbanan (Rabbi’s Kaddish) is a prayer in Aramaic in which the hope is expressed that God’s great name will be sanctified in the whole world He has created and the Kingdom of Heaven be established on earth. It also includes a section asking for blessings for the rabbis and scholars in the community.
Kaddish D’Rabbanan is recited at least once during weekday Shacharit and on Shabbat during Shacharit and Musaf services. It may also be recited at other times and is usually recited after a lesson in torah or other Jewish text. Anyone may recite the prayer, it is not restricted to mourners.
There are any number of customs relating to Kaddish D’Rabbanan and mourners and others should consult with the officiating clergy as to who says Kaddish D’Rabbanan and the amount of time after the funeral that the Kaddish D’Rabbanan is said.
Since Kaddish D’Rabbanan may be recited by anyone, there are fewer restrictions on the length of time that it may be recited after a funeral. There are many customs depending on the mourner’s community and clergy should be consulted with any questions.