Trouble with recording time... HELP!

I’ve been using Audacity for quite some time, mostly using it to create amature singing tracks or MP3’s for my boys. I love the software, but want to use it for an extended period of time, like an eight hour track. Is it possible to keep the program from shutting off? How is it achieved? I’m using Windows XP, have 24 GB of free space, my anti-virus is AVAST, but doesn’t claim to even notice the audio files. I don’t run screensavers… So what am I missing?

I’m gonna try Beta… & re-reading the wiki recording tips… hope it works!