The full NeXTStep documentation, including DPS, AppKit, system administration, NetInfo, etc was about a quarter of that.
Again, the previous was just the windowing system, so at most around 1/10th of the scope of the NeXTSTep documentation, and no, the NeXTSTep docs weren't any less thorough or complete.
So, if you've learned and maybe become an expert in the stuff that requires 3 feet of documentation, you're probably not too thrilled about finding out it's been for naught.