bug#24208: 24.5; How do I get rid of this message? " Saving file /home/j/var/emacs/recentf...Wrote /home/j/var/emacs/recentf". There does not seem to be a recentf variable to get rid of this message.

[Glenn Morris]

You get rid of the message by stopping doing whatever you are doing to
cause it. Normally it's only produced:

1) if you turn off recentf mode
2) when you exit Emacs
3) if you explicitly ask for the list to be saved

So if for you it "keeps repeating at a certain interval", you should
find the minimum example starting from emacs -Q that demonstrates the
issue.