What is the standard arm length for the imam’s elevation above the ma'mum?

The questioner : He said (may Allah have mercy on him). It is disliked if the elevation is an arm’s length or more. Good. Is the standard arm length the arm of iron or the arm of the hand?

The Shaykh : The standard is the arm of the hand. The standard is the arm of the hand, because this is what was known in the time of the Messenger (peace and blessings be upon him). By “hand” is meant the average hand, because some people have long arms and some have short arms, so the criterion is the average arm.