This is a simple plugin to set time interval for successive searches. It allows configuration for guest user as well as logged in user.

The message displayed can also be configured.

The menu item to redirect to can be configured thru plugin manager.

Just download the plugin and install. Or you can use the direct url installation too.

P.S. This is still work in progress and has not yet been deployed on a live site, but I felt like its ready to share with the community.