Following my previous post how to display twitter posts on your site. I decided to tweak it further by adding a time since function and I have also renamed it WOW Tweet Show. Check my footer for an example. This script has been depreciated in favor of the the new Twitter API. Check out Display your Cached Tweets Using PHP and OAuth

Line 66Change USERNAME to your twitter username.
Line 124 displays the time since data.

You can style the CSS to suit your needs.