Posted: 03/03/2015 at 07:11
The point of your run (3:14) Sunnysider, is that you had no plan to run again anytime soon afterwards, which you didn't.
You actually achieved a great recovery for the basic reason you gave your body a chance to have one. Its odds on that anyone racing a HM will be out on the roads the following day, forcing the issue.
When I ran my first marathon, I'd taken a fall the day before and ran with ribs so painful I couldn't breath properly. So I just had to put up with it and ran a tough but restricted race (2:46 if interested), lost about 10 minutes.
A week later I went out for a run, making it up as I went along and found a level of effortless speed and power that had been missing even before the fall. Two hours later I'd run out of road but not energy.
If I'd raced a marathon that day, it would have been a low 2:30!