Glad to see you’ve broken your highest streak!
The experience is different for everyone. Some people have it for a few days - I myself have had them for 1-2 days at a time - others have them for extended periods of time like weeks.
The symptoms are different too. They include the complete loss of erections, zero urges, low energy, low motivation, a state of emotionlessness and more.
The key point to take away is that the flatline means your brain is finally healing. It’s repairing itself from the damage caused by the addiction. It may take a few flatlines to repair. As your brain repairs, sexual dysfunction and fetishes disappear, and your dopamine receptors go back to normal, so you experience greater pleasure from everyday things in your life.
Keep going and stay strong, a far better life awaits you!