> I check email and sometimes answer when on vacation, because often 10 minutes spent addressing a small issue while I'm away prevents several days or a week or two of dealing with a huge issue when I get back.

The question is why ten minutes from home save days of work.

There's something horribly wrong going on if that's the case.

I'm on call a week every month, I get payed for it.

When I go back to work something happened that requires days or weeks of work to fix the issue, I will work to fix the issue for days or weeks, while still working no more than 40 hours/week.

Fixing management problems is above my pay grade.