The default. If I ever need to look through a long thread I change the number of posts by adding “&pp=200” to the end of the URL.
I used to have it set it as long as possible, but the SDMB often seem to run slower than most sites. I found 100 was a nice comprmise from the default.
Still, I wish links in posts would just scroll up rather than reload the whole page. Even at 50 that was way too slow.
200 for me. I like being able to scroll and not click Next all the time. I do the same with Google results too.