Has anyone in this thread ever had the air knocked out of them?
Yep. Playing rugby, getting into fights, etc
getting the Air Knocked out of you is a horrible experience and you think you are going to fucking die. Your body screams that you are going to die since you can't breath. The pain is excruciating.
Yep. You're literally sure you're about to die.
The worst that ever happened to me was in football, I almost lost consciousness, but got my air back in 30 - 45 seconds.
I got an elbow in the solar plexus once from some kid walking past in the corridor. I wasn't expecting it, so could do nothing to prepare myself (not that one can do much to prepare oneself other than tense stomach muscles), and i was gasping and unable to breath or talk for a good minute. Of course, all my mates wondered what had happened because nobody spotted the elbow. Damn lucky shot on the kid's part, too.
The funny thing about this type of injury is that once you recover, the majority of the pain fades immediately and you are good as new within a minute.
Or possibly two, in my worst case. But that's from only one blow, not necessarily more.
Fortunately, they get rescued by some adults who need to carry them away from the beating venue because they're virtually paralysed by the pain.
I have trouble imagining them being paralyzed, yet conscious, for such a length of time that they need to be carried away from the scene. I see it as far more likely that due to the repeated punching and the inability to draw in breath they'd black out and lose consciousness, but probably not for more than a couple of minutes. It *is* possible for someone to be killed if they're punched repeatedly in the solar plexus area. Vomiting is also a likely result.
Also, the exact 'winding' spot is hard to hit accurately, even if someone is being held down. Personal experience, again from school (and i don't say this with pride): got in a fight with a kid, had him by the collar with my left hand and was repeatedly driving fists into his gut. Pretty good power behind them. I hurt him, but never actually winded him properly. Fight wound down and he was a tiny bit winded and in a wee bit of pain, but nothing more.
more info about solar plexus
here, though this is only wikipedia and not a medical textbook
A gut punch is different from being punched in the solar plexus. Boxers take gut punches all the time. Ever wonder why a boxer always compresses his chest and shoulders when he comes in to work his opponent's body over from close range? To minimize the solar plexus area so it's less likely he'll get hit there (of course, i'm no pro boxer, so i might be wrong

).
Does anyone have a realistic idea of when their gut aches would subside and they can go about their business as usual; walk about, eat, ride bikes etc?
Would they be fine after half an hour, or would they need to take it easy for several hours?
If it's a beating to the abdominal region, rather than the solar plexus specifically, then it would depend on the severity of the beating, the strength of their stomach muscles, etc. Could range from anywhere to a minute or two to overnight. I know from memory that sometimes pummelings to the gut don't hurt until the next morning, but unless an abdominal muscle is torn, or a kidney or another organ bruised, it's unlikely to keep them from doing things as normal. Might just be a bit achy.