Your release remains online at PRWeb.com until you delete it. Most users leave their releases online even after they become old news. Leaving older releases online is an effective way of letting people know where you have been as an organization. In certain circumstances, you may want to remove a press release from our archives. Simply log into your account and click the “Delete” link located directly above the headline of the press release that you wish to remove. Please note that PRWeb has limited ability to remove your content from other Web sites after your press release has been distributed.
Depends on your press release content ex. If your content is more unique, informative and helpful to users, then definitely PR web can stay a long long time live. But if you content is irelvant, not good and not informative, then PR web can delete at a time. If you want to your business press release submit a good and quality site and PRweb.com, then you can try http://www.isentia.com.cn website. I am sure it will help you.