A few dozen minutes, meaning anywhere from 24-48 minutes. Read.
Amounted to nothing? It's literally internal damage, why do you expect to see it on the outside? Also, we can't even see Kaido clearly, lol.
Yeah, like you said, that was before using CoC. Then, he combined the 2.
Again, it's internal, lol. You expect blunt attacks to leave scars? LOL
We didn't even see the fight and don't even know Kaido reacted to named CoC attacks, lol. He's not crying because Luffy was a disappointment, he's crying because he thought that Luffy will beat him. He literally said himself that Luffy was the one who made him this excited and fired up after a long time. That itself puts everyone on the rooftop below Luffy.