Question: In some Masaajid, the Imam elongates the salutations [tasleem]. Should the one following the Imam wait until he finishes or what does he do?
Answer: “No doubt he waits until he finishes. However, the Imam should not elongate it. If he elongates, then it is necessary to wait [until he finishes]”.
[Sharh Sunan Tirmidhi no. 48]
Faisal Ibn Abdul Qaadir Ibn Hassan