Those 2 chapters had a lot of dialogues not just fighting or any flashback, so it would last more than couple of minutes, even WB's death news reaches other people in other islands via denden mushi only after that Red dog showed up,
Red dog was no where to be seen here.
Thats enough for a recovery time.
Lmao Red dog was not digging with his barehands, he can travel underground same as outside due to magma ability, which melts the rocks easy. Digging wouldn't take any time for him if he could use his magma, he would catch Jinbe inside the same chapter if he wasn't paralyzed.
You clown maybe can't read, I just debunked your ass about evidence, Mihawk was a famous pirate during Roger execution and 4 years older than Shanks. He reached his prime earlier than Shanks.
Why WB should care about Mihawk vs Shanks duel when Shanks wasn't an Emperor, if Mihawk was already WGS then that would make sense why people heard about it.