What minimum hardware watchdog device timeout is considered safe?

I've recently setup watchdog using Intel hardware TCO that does automatically reboot the system it crashes (using Ubuntu LTS).

In watchdog.conf you can configure a timeout before reboot.

Defaults to 60secs.

Since my devices are playing audio in store which can be really problematic when there is a crash (sound gets stuck in a loop!). I'd like to know how low I could go?

I've used the default in_memory=true and realtime=true.

Thanks!