I bought Windows 95 on floppy disks when it first came out. I think it was 13 disks.

Microsoft used a special format for these floppies, called Distribution Media Format (DMF). It allowed them to fit 1.68MB onto each disk instead of the standard 1.44MB. I just went looking for information about that and found a web page that has not been changed since 1997:

https://www.winimage.com/wimushlp/wini1a1y.htm