Can there be anyway to write and unpublish pages instantly in a few amount of time in Joomla or other Content management systems? If that's the case how?

Cheers

Yes. In Joomla, within the article itself, there's a piece about posting, where one can set INITIAL DATE of Posting and Finish DATE. Automatically, the first date may be the moment you produced and released by the very first time the content... and also the Finish DATE is placed to "NEVER".

You have to edit your article to gain access to this posting section.