the Prophet said: "When one of you leads the people in prayer then let him be brief, for indeed here are among them the young and the old, the weak and the ill. When one of you prays alone, then let him pray as he wishes."  

أَنَّ النَّبِيَّ ﷺ قَالَ إِذَا أَمَّ أَحَدُكُمُ النَّاسَ فَلْيُخَفِّفْ فَإِنَّ فِيهِمُ الصَّغِيرَ وَالْكَبِيرَ وَالضَّعِيفَ وَالْمَرِيضَ فَإِذَا صَلَّى وَحْدَهُ فَلْيُصَلِّ كَيْفَ شَاءَ  

"Messenger of Allah was among the lightest of people in Salat with its completeness."  

كَانَ رَسُولُ اللَّهِ ﷺ مِنْ أَخَفِّ النَّاسِ صَلاَةً فِي تَمَامٍ