Hi, it very much depends on the individual site and how often it is updated normally.
For pages like on this forum. Google spiders and updates within 30 minutes or so it seems. If your site is updated less often then it will take longer for Google to revisit.
A week would be a reasonable average I guess. I assume you submitted a sitemap? Was it just the Title tag and Meta description that changed?
It's possible you could still be queued for a revisit but I would have thought it wouldn't take much longer.
Peter