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You should know that today's spidering search engines will not pay any attention to this meta tag. They crawl on their own schedule and that's that. The creation of this tag was a questionable idea at best, probably based on a lack of vision or a poor estimate of how big the web would become.
That said, here's the syntax:
<meta name="revisit-after" content="30 Days">
Modern crawlers really appreciate it, and they may be able to spend the allotted time for crawling your domain to find more pages, instead of gathering the same ones they already have.
Straight from GoogleGuy:
[webmasterworld.com...]