In Paradise, there is a tree under the shadow of which a rider can travel for a hundred years without covering (the distance) completely. This hadith has also been transmitted on the authority of Abu Sa'id al-Khudri that Allah's Apostle ﷺ is reported to have said: In Paradise, there is a tree under the shadow of which a rider of a fine and swift-footed horse would travel for a hundred years without covering the distance completely. There would be the pleasure of Allah for the inmates of Paradise and He would never be annoyed with them.  

عَنْ رَسُولِ اللَّهِ ﷺ قَالَ إِنَّ فِي الْجَنَّةِ لَشَجَرَةً يَسِيرُ الرَّاكِبُ فِي ظِلِّهَا مِائَةَ عَامٍ لاَ يَقْطَعُهَا قَالَ أَبُو حَازِمٍ فَحَدَّثْتُ بِهِ النُّعْمَانَ بْنَ أَبِي عَيَّاشٍ الزُّرَقِيَّ فَقَالَ حَدَّثَنِي أَبُو سَعِيدٍ الْخُدْرِيُّ عَنِ النَّبِيِّ ﷺ قَالَ إِنَّ فِي الْجَنَّةِ شَجَرَةً يَسِيرُ الرَّاكِبُ الْجَوَادَ الْمُضَمَّرَ السَّرِيعَ مِائَةَ عَامٍ مَا يَقْطَعُهَا