Post Dhuhr Prayers is among the most recommended times for invoking the early reappearance of our master, Imam-e-Asr (a.s.)
Imam Sadiq (a.s.)says,“One who says the following after the morning and noon prayers will not die till he reaches to the Qaem (a.t.f.s.) of Ale Muhammad (s.a.w.a.).”,

اََللّهُمّ صَلّ عَلٰی مُحَمّدٍ وَ آلِ مُحَمّدٍ وَ عَجّلْ فَرَجَهُمْ.