Web Design Portfolio Updates: How Often Is Too Often?

It feels like we're always behind when updating our web design portfolio on the Sandstorm website. Does anyone have any feelings on how often we should be updating our creative work - monthly, weekly, quarterly, whenever we have time to? It's great that fresh work is always being produced, and I'm proud of the quality of award winning work we do, and want to give ample time showering our clients with pride and love by showcasing them on our web site... but right now our timing is pretty random. We're always working on content in our web site and changing that almost daily (as part of our SEO and keeping the site fresh), but those portfolio pieces tend to lag a bit. Maybe I should assign the portfolio update task to the new guy at our web design firm (he he he).