thaivani

Dear Sir, I came across a money mantra on the net. "Ya Devi sarvabhutesu Ratna rupena sangstitha Nastasvai namastvai Namastvai namo namah" It was given to a student who was having financial difficulty. It has to be recited for 13 days and after that it improved her financial status. Now I would like to know how many times you have to say the mantra and the best time to say it. As I know some mantras you have to say 108 or according to the mantra.thank you Regards Thaivani