Śrī Matre Namaḥ
- "Can I do much recites more than 3..?" Please clarify what you mean by "3…"? Three times a day?
- "Can I do havana with this mantra..?" Please clarify what mantra are you referring to? The entire Śrī Sūktam or a specific mantra?
- "Can I add Dum beejam before '' durge smrita '' along with " om srim"" - usually it's done at the direction of your Guru.