Uite ce spune Google (ceea ce oricum se stia de peste 3 ani):

More pages use the completely worthless <meta name="revisit-after"> than use the <em> element!
Uite ce spune un site bine infipt si respectat din industria SEM:

The revisit-after META tag is not supported by any major search engines, it never was supported and probably never will be. It was developed for, and supported by, Vancouver Webpages and their local search engine searchBC.
Uite ce spune un moderator din WebmasterWorld:

The meta revisit-after tag is specific to Vancouver Webpages searchBC. There are no other search engines that I'm aware of who have created a reference lexicon called a profile to support the revisit-after directive. I'm basing this statement on years of metadata research.
Uite ce spune un raspuns (postat de un veteran, ca reputatie) din Google Answers:

Some still believe that the re-visit tag can be beneficial with some
search engines but in truth, most spiders nowadays ignore the revisit
tag altogether, though a few, such as Inktomi still recognize them. It
should be noted however that most search engine spiders will generally
revisit your page regardless of this tag "provided” that your site is
already in their database.
Te las pe tine sa decizi.