What is the limit for expediting a funeral procession according to the Prophetic Sunnah, such that it does not cause hardship to those accompanying it?

It is sunnah to hasten the burial of the deceased, and the funeral procession should proceed at a light, swift pace, slightly faster than normal walking, in a manner that does not burden those carrying or following it, and does not harm the deceased. The command to hasten is for recommendation, by agreement of the scholars.