Good info coming in here. Thanks.

Good to know that rescues start even if it is dark.

I still think I'll have my wife call for help the morning after my planned exit day, though. I can think of several pretty ordinary causes of being 1 day late (e.g. foot bridge out after heavy rain.) If I need help sooner I can press the PLB.

I'm still torn about being OK but more than 1 day late. Pressing PLB makes short work of "search" portion of search and rescue and it seems that I'm doing everyone a big favor. I would be violating the "life and limb" rule, however.