How long before Google de-indexes my 301 redirected URLs?

I decided to use 301 redirect when I started a new site that included some of the content from an older one, I was told that this was the best way to avoid a duplicate content penalty.

A week later, the old domain still appears in the SERPs while the new one isn't even indexed yet. I was wondering if anyone here went through the same process and how long does it usually take for the older site to disappear in favor of the newer one?

Have you pinged your new url yet?

bendutchman said:

Have you pinged your new url yet?

Click to expand...

Not yet, I just submitted the sitemap.

I think the issue here is that somehow google doesn't recognize the redirect and treats my new site as duplicate content.

I wonder if setting up 404 error pages would result in faster deindexing?

All you need to do is 301 redirect and ping. Then just be patient. Google will update things soon enough.

submit ur old url to google again. for me it works all the time. make sure u have setup 301 correctly to all pages