These work too, I tested them out in October November.
As far as siddhi goes, it tends to vary by the mantra and purpose significantly, though I’ve read about lahks and how to count the syllables, something like om for chakras takes 1,250,000 reps for one siddhi, yet the mantras I worked with from December-February, each varied from 6800 (and change) to 10,000.
It’s pretty noticeable when you get near a siddhi, at least if you are practicing daily, as you reach a point where even if you stop chanting the mantra simple continues in your mind, no matter what you are doing and I experienced ear ringing, and energy influx as well around the times I reached them.
But something I noticed in one of Baal Kadmons books, thst I don’t see addressed all that often is that- after you become attuned to the energy of the mantra, you still need to direct that energy at your goal to see results- he of course said it better. 