As it's 4 hours off / 1 hour on, the device is not very suitable for stalking someone. Also once the AirTag is back on and the person starts moving, they will be alerted that the AirTag is tracking them.
Not trying to be creepy, I’m just trying to demonstrate how we all need to think like adversaries (eg creeps) when designing products.
imo no level of stalking is appropriate. while this device might not do everything a stalker wants it to, it surely makes it easier for them
I once donated an infant car seat to a coworker but forgot I had put an AirTag on it. After she had taken it home, her iPhone told there was an unknown AirTag and she texted me. I apologized profusely and she wasn't bothered by it. Nonetheless had I been nefarious, I would have been able to get her home address.