5. For how long may the comforters remain by the Avel?

Not to talk extensively:[1] It is forbidden [for the Avel and comforters] to talk extensively.[2]

Time to leave:[3] When the Avel nods his head to the comforters in a gesture that expresses his wishes to end the visitation, the comforters are no longer permitted to remain by him [so that he not be a burden onto the Avel[4]].[5] [The comforters are to be sensitive and pay attention as to if the Avel now desires to be left alone, and are hence to end their visitation.[6]]

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[1] Rama 386:1; Rambam 5; Kol Bo

[2] The reason: If it is forbidden for the Avel and comforter to exchange greetings, then certainly it is forbidden for them to talk extensively. [Rama ibid]

[3] Michaber 376:1; Moed Katan 27b

[4] Rambam Avel 13:2; Meiri Moed Katan ibid

[5] The nodding of the head is a form of saying good bye, although since an Avel is prohibited from saying Shalom therefore he must nod in its stead. [Ramban Moed Katan 28b]

[6] Aruch Hashulchan 376