Hazrat Haji Ahmad Nakhuda رحمه الله used to say that Moulana Rasheed Ahmad Gangohi رحمه الله mentioned,
“A wonderful prescription for a person’s permissible ambitions of this world and the next is reciting Durood Shareef 500 times.
When people used to present their problems to Hazrat Shaykh Zakariyya رحمه الله, Hazrat would tell them to recite Durood Shareef 500 times keeping their needs in mind, facing the Qiblah, in the condition of Wudhu. They would later return and acknowledge that their needs were fulfilled, and problems solved.”
(Gumbad Khazra ke Saaye Mein pg.166)