Lengths aren't fixed, but give a realistic estimate, and please don't exceed 30 minutes unless you have something special planned (in that case, contact one of us). We will typically go for 30-minute slots -- shorter talks, unless they're really short, usually tend to screw up the schedule too much. You aren't limited to slide presentations, of course.

Tips for bartering: - Assess the value of your services in estimated hours - or an hourly rate - to determine the value in trade. Factor in buffer time for the unknown's. - Provide images of the item, amenity or "end-results" of your service with your posting. This should increase the interest in your post significantly.

Bernhardt suggests using an online net price calculator to get a rough estimate. Pick three or four schools in your area, some private and some public. Most should have an online calculator tailored to their own institution. The College Board has a more general calculator online.

The study was underwritten by Citi Foundation and the economic estimates were prepared by the University of Georgia's Selig Center for Economic Growth.