My first homebrew that I used the longest, but stopped using about 8-10 years ago ended up with at least 150 pages if you count the maps. Probably closer to 120 pages if you don't count maps. I loved those maps. I wrote all kinds of things, though, timelines, NPC writeups, city stats, and even laws for some of the more strict areas. Then one day I bought a Planescape box because we were doing a short trip to the planes and... well... the homebrew was shelved. ^^;
Nowadays, I use Planescape, and often "homebrew" a part of it, wherever the main action is going to take place. So I guess my real answer is my homebrew is a published setting.