People need to remember that she's been fighting them since 1000:
1002:
1009
1011
1022
1029
1030
This is about a chapters worth of her solely attacking Kid/Law (and Killer) BEFORE they use awakening, which is 4 additional pages in 1030, and is given 5 pages of reaction/fallout in 1031. Then they get another 6 pages last chapter, followed by what is presumably 14-15 pages of fighting this chapter.
Then I didn't even include Kid's double spread against her in 1013 either.
Adding all that together, it's well over 50 pages of fight content EXCLUSIVELY with Big Mom EVEN when things have been offscreened. It's literally more than Sanji and Zoro get for Queen and King, which were both under 50 pages total, and still their longest fights ever.
Tldr: Big Mom's fight is ironically the longest fight in Wano (including this chapter) save for Kaido even with the offscreening. This doesn't include her attacks against Luffy and Zoro earlier on, stuff before the rooftop, and some of Kid and Law's attacks.