“The Prophet ﷺ used to observe I’tikaf for ten days every year. In the year in which he passed away, he observed I’tikaf for twenty days. And the Qur’an would be reviewed with him once every year, but in the year in which he passed away, it was reviewed with him twice.”  

كَانَ النَّبِيُّ ﷺ يَعْتَكِفُ كُلَّ عَامٍ عَشْرَةَ أَيَّامٍ فَلَمَّا كَانَ الْعَامُ الَّذِي قُبِضَ فِيهِ اعْتَكَفَ عِشْرِينَ يَوْمًا وَكَانَ يُعْرَضُ عَلَيْهِ الْقُرْآنُ فِي كُلِّ عَامٍ مَرَّةً فَلَمَّا كَانَ الْعَامُ الَّذِي قُبِضَ فِيهِ عُرِضَ عَلَيْهِ مَرَّتَيْنِ  

The Prophet ﷺ used to spend the last ten days of Ramadan in I’tikaf. One year he was traveling, so the following year he spent twenty days in I’tikaf.  

أَنَّ النَّبِيَّ ﷺ كَانَ يَعْتَكِفُ الْعَشْرَ الأَوَاخِرَ مِنْ رَمَضَانَ فَسَافَرَ عَامًا فَلَمَّا كَانَ مِنَ الْعَامِ الْمُقْبِلِ اعْتَكَفَ عِشْرِينَ يَوْمًا