subwoofer There is only one option, 5 minutes
This is true but not if you set a different lock for Private space than the device lockscreen.
If you go Settings > Security and privacy > Private space > Private space lock
set a new lock for just the Private space, then the options goes: https://imgur.com/a/QZFJfD0
Still not fully free, but there's a difference between 5m, and 30m.😉
I may be needed to alter
Settings > Security and privacy > Private space > Lock private space automatically
to 'Only after restarts', for this to work.