How to bulk delete posts only?

I have about 400 POSTS posted in one of my Wordpress setups and I want to delete ALL posts (but nothing else, no pages, just posts). When I checkbox 10 or more, it will delete some but it times out. About 10 at a time is my max.

I tried a BULK DELETE plugin I found, but that too timed out. Is there a way to do this, perhaps directly in myPHPadmin or some other way?