Several tens of minutes in the raw, from Law and Zoro falling down, while Luffy and Kaido fought 1vs1.
Zoro didn't win in a full powered both sides 1vs1, Zoro put his all into a finisher while Kaido was just trying to swat him away due to his focus being on Luffy- see Kaido's neck TURN before this. Kaido underestimated Zoro, but Zoro was dissapointed by the outcome of this clash that didn't bring Kaido to his knees. Luffy's "wins" after learning adv CoC and smashing Kaido around for 2 or 3 hits in 1010 are far bigger "wins" in shock and awe to Kaido but I don't see you calling those wins lol, I wouldn't either because Kaido was again somewhat off guard and the next chapter they were clashing EVENLY.
A transient win in a few clashes means nothing (especially if like Zoro you need to use your ultimate attack to outclash an off guard Kaido).