How often does Google's Safe Browsing system expire URLs that are 404?


Numerous customers that have had phishing issues reported to them as a result of Google’s Safe Browsing program have taken care of said issues. The URL(s) reported to them either return a 404 or 5xx error but the URL stays listed, according to the GSB’s API, for weeks afterwards.

Does anyone know:

  1. Is there some kind of expiry time on URLs flagged as unsafe by GSB
  2. Is there some way for us (the provider) to trigger a review of the URL to speed this process up?

Harassing the client to login to the webmaster portal and request a review can be a cat herding exercise.

Thanks for any info you might have.