Sayyiduna Abu Hurairah, may Allah be pleased with him, narrates this statement of the Prophet Muhammad, peace and blessings be upon him: "When someone leads people in prayer, he should make it short because among the people are those who are sick, weak, and elderly. When someone prays alone, he may make his prayer as long as he wishes."
Hadith Referenceصحیح ابن حبان / كتاب الصلاة / 1760
Hadith Gradingفضيلة الشيخ الإمام محمد ناصر الدين الألبانيصحيح - «صحيح أبي داود» (759)، و «الإرواء» (2/ 291 / 512): ق.فضيلة الشيخ العلّامة شُعيب الأرناؤوطإسناده صحيح على شرطهما.