How do I increase the length of blog post title excerpts on the main Network page?

Howdy! I love Network. But I'm curious how I might tweak the length of Title excerpts slightly in the direction of longer on the front page. Example on my site:

http://coyot.es

One of my member blogs' most recent post titles is "Inventing novel food webs for a brave new world." On the main page, it is excerpted as: "Inventing novel food webs for..."

Obviously there need to be some limits on title length, but that title isn't horrendously long. Any advice?