How long should you leave keywords on your site related to your old brand?

[sdaily]

We rebranded our organization 2 years ago. We decided to leave some of our archived content with our old name because it was already serving link juice to the website. How long should you leave keywords like that on your site related to an old brand?

[JackSaville]

As long as the content is bringing you traffic and conversions, keep the content online. Maybe you could place a popup on the old content to explain to people that you have rebranded, just so they don't get confused.