EDIT: ALL SORTED thanks to the Awesome @FrAsErTaG
Hopefully tomorrow 28th May 2024 (Australia). We will be doing a security update. Sometimes this goes really well other times it can be a process and the forum can go down for a while.
How long if it does?
As short a time as possible as there is a third party involved in the procedure and sometimes they stuff it up.
So if the forum is down you wont be reading this but hopefully you already have and you know why.