Was this off of CD-ROM or a stack of floppies? I think 3.11 was the last of the floppies, but memory is hazy around what 95 install media was. Pretty sure 98 was CD, but that could be a fun "bonus round" to force an install from floppy.
https://i.imgur.com/iVNVleR.jpg
The media I copied from took up 28x 3.5" HD floppy disks. It's possible they were copied from what was originally a CD-ROM. I don't remember clearly anymore.
Note: I'm not trying to refute or correct your 13-disk figure, which was clearly a different installation set, and likely original Windows 95 rather than my OSR2, which came out around 1997.
[0] https://devblogs.microsoft.com/oldnewthing/20050819-10/?p=34....
Now I know why.
Edit: just checked in Google. Win95 was just 13 floppies. But you had MS Office and other software that was additional floppies to install.