[gaius]

3 people who never get sick, never go on vacation or training, who never experience denial of physical access (or who actually live inside the NOC??)

Oh, you are talking about people who just phone other people, well you need to include the "other people" in your number.

[peterwwillis]

The "other people" are just people in your company. They aren't on call, but since they own the thing that's broken they get called, it's standard escalation.

Two people on shift per weekday, three on weekends, and a non-NOC staff member works a shift on a weekend so they can cover sick time and vacation people. It's not that hard.

[gaius]

Your people are doing 12-hour shifts every day, and only get sick at weekends?? I call shenanigans.

[peterwwillis]

They don't need to work during the day on weekdays.