Not a bad set up you have there, Christopher.
Keeps me busy day and night!
Do you occasionally get to use any of them?
We call 'em "engineering nights".
It's when we get the scope for a night to do engineering runs to test or troubleshoot scopes and/or various instruments or control systems.
Imagine having the Keck Twins for an engineering night? Kind of like driving a Ferrari F4 down to the 7/11 for some milk and eggs. ;-)
The Keck twins are rarely used together these days and mostly run independent observing schedules. Due to NASA's decision to terminate funding, the Keck interferometer has been mothballed until further notice. The other instruments on each scope are a bit different so there would be reasons why a researcher would want to use either Keck1 or Keck2. And I can't think of a time in recent history that both scopes were scheduled for engineering nights at the same time.
Keck has a large existing engineering team and so far has not needed my company to provide any engineering or technical services.