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With really good visualization to start, it took me six months of daily practice to see faces move, smiles, talking etc. When I started it was pretty average in terms of being able to see people, just disjointed body parts and still frames. After 9 months it was good, good enough. After 2 years it was realistic to better than dreams. At 33 months it was too good and I had to stop because hearing the news about rapes and murders immediately caused that to play out in my head. I couldn't watch horror anymore etc. I cut back and in a few months it was at a good place. I don't know if it will get there again with intrusive horror because it might have just been a phase like intrusive thoughtforms were in the beginning.
So practice works if you have a passion for it otherwise it probably won't go that far because to get to the better than dreams phase it took literally years of daily effort and frankly you'd already be on your way if you had a passion for it.