For my website, it took ~3 months for my author information to show up in the SERPs.
When I implemented rel=author back on February 13, 2012, I knew it would be troubling, and also disappointing, if I went to Google and queries site:jacksonlo.com everyday and see my author information not showing in the SERPs. So I didn't, and you shouldn't either. I did, however, check 1-2 weeks and nothing showed for 3 months (until today).
I discovered a few things while implementing rel=author on my WordPress site, but in the end, there may be factors that influence how quickly rich-snippets take to show up in the SERPs. For example, I think a fair assumption is that, the timeliness of rich-snippets showing up in the SERPs is dependent on how often your site (pages on your site) gets crawled per day. This means, how often does Google bots crawl yours site and how many pages they crawl. A lot of times, this also means the frequency at which fresh content is published on your site.
Why do I speculate that?
- My website traffic is ~5,000-6,000 visits per month = Rich-snippet appeared in SERPs ~ 3 months
- Client website traffic is ~100K visits per month = Rich-snippets appeared in SERPs within 1 week (wow!)
- How active the author is posting updates on Google Plus (their Google+ account)
- How often your site gets shared on Google Plus (links from your site shared on Google Plus)
Just remember one thing; Google does not guarantee that author information will show up in the SERPs:
If you want your authorship information to appear in search results for the content you create, you'll need aGoogle+ Profile with a good, recognizable headshot as your profile photo. Then, verify authorship of your content by associating it with your profile using either of the methods below. Google doesn't guarantee to show author information in Google Web Search or Google News results. (source)
This video dates back to 2010… where Matt Cutts asked their rich-snippet team how quickly they'd would show up in the SERPs, and a few things to keep in mind (something worth reviewing quickly): http://www.youtube.com/watch?feature=player_embedded&v=thS5ryMXN88
And this one on Authorship markup on August 9, 2011: http://www.youtube.com/watch?feature=player_embedded&v=FgFb6Y-UJUI
Have you seen similar behaviour with author information showing up ranging between days and months with your site or your clients'? Would love to hear some comments down below!