301 Redirect for dupe content - how long to take effect?

[adresanet]

Hello,

For one of my sites I made a lot of 301 redirects because of duplicate content.
I start to implement these redirects for 3 weeks and I see for some urls which were crawled by googlebot in 10.01.2015, 18.01.2015 and 28.01.2015. How long should I wait until googlebot will forget the old urls and won't crawl them and, of courser, will delete the duplicate content issue ?

[Wilburforce]

How long should I wait until googlebot will forget the old urls

I am still seeing "new" Broken Links "linked from" pages that haven't existed since 2012, so I wouldn't hold your breath.

[Robert Charlton]

I am still seeing "new" Broken Links "linked from" pages that haven't existed since 2012, so I wouldn't hold your breath.

Google periodically rechecks old 404s, 410s, and old redirects... as it's a search engine and doesn't want content to be forgotten should someone change their mind. Google will recheck in particular when there's an update in progress, and that might be happening now.

I don't think, though, that this is the main thrust of the question. I assume these redirects were either for canonicalization or to get rid of extra pages that were dupes, and the poster is eager to know how long it wil take.

I recommend this thread as worth reading, even though it's from 2012...
Domain 301 Redirect - How Long to Change the Index?
Sept 2012
http://www.webmasterworld.com/google/4499653.htm [webmasterworld.com]

There's no one answer, as I think new index time depends on multiple factors, including when in the index cycle you've caught everything, the quality of your inbound links and how often Google respiders your site, and what kinds of complexities Google might encounter in making the switch over.

g1smd's summary is probably the best good-case summary in the thread...

New one should appear in days.

Old one can take months to drop out. This is not a problem.

But I've seen it take a few days or weeks to nine months... the latter in the case of a domain change many years ago during the infamous "sandbox" period. This nine-month delay is the type of thing one tries to forget ;)

Note that once you set up a 301, it's got to stay in place more or less forever. Don't assume that once Google has once seen that you intended a 301 that they will remember this. You've got to keep it in place, and if it was a cross-domain redirect, you should plan on holding the old domain in perpetuity.

[Sudipto]

Keep in mind that SEO juice do not leak floor when you change your website URL. A properly set up 301 redirects can exactly tell Google whats going on. If your audience has to deal with “Page not Found” errors then it will be all in vain.

[lucy24]

How long should I wait until googlebot will forget the old urls

"Until the cows come home" should cover it.

I moved near the end of 2013-- that is, just over 14 months ago-- with proper 301s throughout. The major search engines are still periodically requesting URLs from the old site. All I can say is that the total number of requests has dropped to about 1/4 what it was at the beginning, and that most of the drop took place over the first two months or so. (This is a crude estimation based purely on the size of the text file where I keep the data.)

If you end up removing any given URL (410), make sure the old forms of the same URL also return a direct 410. This tends to make the googlebot go away faster.