How long can I record background sound for? ( to record while I'm sleeping)

Hello SenpaiDaiken,

The audio-only recording feature of Bandicam doesn't have a time limit. Even with the free version, you can record your computer sound nonstop for over 24 hours without stopping.

https://www.bandicam.com/how-to/audio-only-recorder/

If you record audio with the screen, the free version is limited to 10 minutes per recording, while the full (registered) version has no time limit and can record for more than 24 hours.
https://www.bandicam.com/faqs/free-full-version/

Thank you.