Duplicate Title Tags & Duplication Meta Description after 301 Redirect

[CommercePundit]

Today, I was checking my Google webmaster tools and found 16,000 duplicate title tags and duplicate meta description.

I have investigate for this issue and come to know about as follow.

I have changed URL structure for 11,000 product pages on 3rd July, 2012 and set up 301 redirect from old product pages to new product pages.

Google have started to crawl my new product pages but, De-Indexing of old URLs are quite slower. That's why I found this issue on Google webmaster tools.

Can anyone suggest me, How can I increase ratio of De-Indexing for old URLs? OR any other suggestions? How much time Google will take to De-Index old URLs from web search?

[IM_Learner]

There is no set time for this process to be completed. It depends upon how fast Google comes across the old urls and visit the new page. Since the 301 redirect is working fine, you need not to worry about it.

[avassa]

You can't force the rate at which your site's old content is de-indexed and accounted for using the new pages. Leave that to Google and have some fresh juice to lighten up.

Cheers,
Rajesh Dhawan