I let my French press simmer for 20 minutes, as recommended by James Hoffman, but only when I bought properly grinded coffee.
Edit: I just saw the video again and he said 4 + 5 to 8 minutes for a 30gm of coffee and 500gm of water. I usually do the double and maybe for that I was also doubling the time? Lmao, have been so many years doing it like this that I was sure was the way he said it should be done.