Minor tweak for showing new forum posts?

Sol, new forum posts shown on the righthand control on the home page disappear too quickly. Some days they hang around for most of the day, and other times they disappear after only a few hours, regardless of whether I've read them or not.

Would it be possible to continue to show the new posts for a minimum of 24 hours? I'm on the system most days and the home page is where I look for new posts.

Thanks.
Dirk