Muhammad b. 'Amr said in his version: After six years. Al-Hasan b. 'Ali said: After two years.
In-book : Book 13, Hadith 66
English translation : Book 12, Hadith 2232
13. Divorce (Kitab Al-Talaq)
باب إِلَى مَتَى تُرَدُّ عَلَيْهِ امْرَأَتُهُ إِذَا أَسْلَمَ بَعْدَهَا