In the admin panel, Spam section, there is a configurable option : "Rate limit for asking questions".
Its default value is 20 (questions) "per IP/hour" and 10 (questions) "per user/hour".
There's not a "per session" global option.
Welcome to the Q&A site for Question2Answer.
If you have a question about Q2A, please ask here, in English.
To report a bug, please create a new issue on Github or ask a question here with the bug tag.
If you just want to try Q2A, please use the demo site.
April 20, 2021: Q2A 1.8.6 released!