Board Thread:Boruto Discussions/@comment-5085906-20170430152255/@comment-4961229-20170516140736

Thekillman wrote: You're suggesting now that he memorized the chakra of every single citizen of Konoha? People who aren't even sensors regularly recognize the chakras of people they only met once, some times years later. We're talking about a sensor here. Either repetition or intensity of experience leads to clear recollection of someone's chakra, especially for sensors. Orochimaru and Sasuke recognized Naruto's chakra in chapter 616. Orochimaru actually says, none of us are sensors, but points out this is Naruto's chakra.

Am I supposed to believe Minato, who's a ninja that's been in war and on multiple missions, never went to the hospital enough or worked alongside them in the field to recognize the chakra of at least a few medical nins? He somehow can't replicate what Orochimaru, who met Naruto only a few times, could do? Thekillman wrote: We don't really have an accurate timeframe for this. Both seemed to have been out of it for a few minutes, tops. Regardless, the crux of your argument is that Naruto received time critical medical ninjutsu, which Sakura said was "having no effect," that Kushina had no access to.

With the last of her chakra she sliced his chest open and manually massaged his heart with a regular medical technique. So the only difference between him and Kushina was he dropped dead and had to be revived. She didn't.

We are never told anything like what you claim in the manga. The only time limit appears to be death. Any other limit is literally your headcanon, nothing more.