A hard flaccid state is another way your penis responds to possible damage. It acts like a protective shield when there's no response from the nerve branches. Commonly, as the nerve branch heals, anywhere between 5 to 7 days on average, the hard flaccid symptoms go away but not completely until the nerve branch is completely healed. When you injure your nerves from going too hard, too fast, and too long, such as issues from clamping or too high pressure that your penile shaft cannot handle due to insufficient conditioning, the injury may need more than 15 days of recovery. Most nerve damage recover within 6 weeks. Some tend to linger based on how bad the damages may be.
In the meantime, warm oil massage will encourage flow. Reverse kegel exercises (not kegel) will get the blood to flow into the pelvic region and penile body. Stop with the stretches. You can keep your penile shaft elongated, but no stretches. You can get erected and semi-erected during light and deep tissue massages using warm oil. But stop with the stretches until it's healed.