I try not to but it has been below 10% many times (and occasionally so empty it turns off).
Now WFH, so it has been plugged most of the time since late March and I'm really just nursing it through until the newer phones are released so I can decided whether to get the updated SE or the newer model.
Ideally you would stay between 20-80% (only charging to 100% and discharging to 0% when you really need it)