Basically the question I am asking is how long does a link have to stay up for google to have clocked it and validated it as a backlink. Would the link have to stay up until the next PR update for me to see a change in my PR.
In my opinion you must maintain your backlinks as long as you can. and I got a tip for you, always monitor your link partners if they still connected to you so won't loose your links.
think to build a Brick Wall.. you have to put Bricks one after another.. and would you liketo get previous bricks from its position.... certainly not.. otherwise the wall get collapse..
here similar strategy played...
thanks
Arun
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Even after the PR update your links will be still visible. If you want to check your backlinks try visit backlinkwatch.com.
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Basically you just need to keep building your backlinks, it is very tiring since its like a forever job, that's the very reason why a lot just hires a freelancer or some seo company.