Answer

Many benefits are cited on the recitation of Duruud Tunjeena. Scholars and Awliyahs base these benefits on personal experiences. There is nothing wrong in mentioning those benefits as long as they are benefits of this world. However, benefits specific with the hereafter have to be established from Allah (SWA) or the Prophet of Allah Sallallahu Alahi Wasalam.

The benefits citied and believed by many in reciting Duruud Tunjeena are linked with worldly benefits.

Only Allah Knows Best