I've been using Obsidian long enough to have accumulated about 2500 separate notes in it as of early February 2023. My goal, such as it is, it to let this total get to about 10000 pages, and then to re-evaluate everything. I'm on pace to hit that by something like 2027.
I use it for everything that might be useful in a daily diary. That means pages for dates, locations, names, etc. The rule of thumb: if it's a noun, it might be a page.
As you might expect with so many pages, most of them are short, suggesting they are there to jog my memory and not to replace it.
I like Obsidian but it's not my first go-around using a wiki as a personal knowledge base. The previous observations are probably true here too: if it gets large enough to really be interesting, it's too large to keep current. You're best off putting dates everywhere you possibly can, so that things that are stale are more obviously stale, and that observations that are old are treated as historical.
1600 pages: https://vielmetti.typepad.com/logbook/2022/06/obsidian-as-a-daily-note-taker-a-year-out.html
