[Hampshire] [OT] Audacity

Hi all

Anybody know if it's possible to get Audacity to record and stop recording after a fixed length of time?

I'm trying to copy loads of old C90 cassettes to digital and if I forget - I'm very often left with 4 and 5 hour recordings which I need to stop and chop off the last 4 hours. Not the worst job in the world, but a slow process given the size of these files - is there a way to "auto stop" it after 45 minutes?

Cheers
Rob