I wondered why my question list stopped at 667 pages and did not display all questions.
Found the answer finally:
In qa-app-format.php the last page is determined with:
And in qa-config.php you find the constant:
In other words, q2a limits the list of questions to 19999 by default config.
Hope that helps,
QA_MAX_LIMIT_START is the maximum start parameter that can be requested, for paging through
long lists of questions, etc... As the start parameter gets higher, queries tend to get
slower, since MySQL must examine more information. Very high start numbers are usually only
requested by search engine robots anyway.