Hussar
Legend
In 3E, he'd have received back 10 of those 15 hit points (10th level wizard). So, not quite back to full HP (his chest would probably still be tender) but mostly back to fighting shape.
Yup, and got tapped with a cure light wounds, or a simple Heal check and he gets twenty points back. It's a 10th level party and a DC 15 check. It doesn't even need a roll.
So, you have no problems with all hit points being recovered overnight without magic? 10th level wizard without a Con bonus averages (4+2.5*10=) 29 hit points. He can lose over two thirds of his hit points, IN A SINGLE HIT, and recover from it in a single night of rest.
And that's apparently believable. But, 4e HP aren't?
This is why this discussion can never progress. The HP=Meat argument is so full of holes that it makes swiss cheese look solid. Everyone points to the fighter and he's got lots of hit points, so it takes a bit longer to heal. This 10th level wizard cannot EVER take a wound in 3e that cannot be healed in two days.
Not ever. You cannot narrate any wound that doesn't kill this character that cannot be fully healed in two days. Actually, that's not even true. You cannot narrate any wound that doesn't outright kill this character that cannot be healed in a single day because with a full day of rest, this character regains FORTY HP. He's only got 29 to start with and 39 with the death's door rule.
Even a 10th level fighter who takes 39 points of damage in a single hit - certainly a pretty solid hit, cannot ever be narrated as taking a wound that cannot be FULLY recovered from in one day.
To me, and I've argued this before, the only resolution here is to have two baselines. You have the "HP=Meat" rules and the "We don't want to bother screwing around with healing" rules. HP=Meat looks a lot like 3e and earlier and makes clerics and/or other magical healers a pretty much required member of hte party. The other crowd looks a lot like 4e. Since both crowds will heal up to full in close enough to the same time (sorry, but three days vs one day REALLY isn't going to radically change most scenarios) you can have them both as baselines and everyone is happy.
Or, you take the "You heal full" rules, slow them down and you make the HP=meat crowd happy again.
What you can't do is use the 3e and earlier rules as the baseline and tell everyone else to screw off. Because the HP=Meat rules are too limited to be broadly applied.