I thought G5's time limit was closer to 15 mins, someone gave a rough estimate iirc.
Honestly nerfed Kiz handling him offscreen seemingly mainly via defense is crazy impressive.
People hype up Kaido for "needing help" to be beaten by G5 but forget that Luffy was still very weakened from dying at that point while Kaido had no serious problems outside of some exhaustion.
Borsalino fought a healthier Nika who was more skilled with the form too.
People will soon start to accept Borsalino > Kaidou I think.
Think about why Oda would make Kizaru name drop Kaidou as someone Luffy is capable of beating, while bodying that same Luffy visually. Just think of why Oda would even bother inserting that line via Kizaru's own mouth if Kaidou is supposed to be this unbeatable character from his POV. Then you stack this with the fact that he alone was willing to go halt Kaidou and BM from meeting, things will add up. When we see Akainu who was his peer go all out this will become a very common opinion, people just aren't ready for it yet because Kaidou is still very fresh. With the recent confirmation of invisible adCoC it's even more obvious this was a non factor in Kizaru vs Luffy.
I myself had Kaidou >= Kizaru entering Egghead, but the truth is the deeper we get into the series the less Oda will care to preserve Kaidou, especially now that he effectively found a new toy monster to fill that "oni" role. Oda wasted no time diminishing a lot of the back and forth Luffy and Kaidou were having immediately after wano. Going toe to toe with base Luffy looks bad now after Kizaru.