The Apostle of Allah (ﷺ) said: When any one of you leads the people in prayer, he should be brief for among them are the young and the aged, the weak and the sick. But when one of you prays by himself, he may (prolong) as he likes.
Reference: Sahih Muslim 467 a In-book : Book 4, Hadith 208 USC-MSA web (English) : Book 4, Hadith 942 (deprecated)
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