The average reading speed is about a page every 1-2 minutes (for non technical texts). 100.000 pages would then be a 800-1600 hour read, which is about half a year for a person spending 8 hours a day just flipping through pages.
Obviously such a manual is probably not meant to be read cover to cover, but even compared to a reference work, it's three times the volume of the entire Encyclopaedia Britannica - a giant amount of information to be easily used.
The average reading speed is about a page every 1-2 minutes (for non technical texts). 100.000 pages would then be a 800-1600 hour read, which is about half a year for a person spending 8 hours a day just flipping through pages.
Obviously such a manual is probably not meant to be read cover to cover, but even compared to a reference work, it's three times the volume of the entire Encyclopaedia Britannica - a giant amount of information to be easily used.