During my interview in Frankfurt, this was one of my questions.
"With a fleet of this size and type of on demand operations and staffing levels, why the need" and "what is the call out time"
Never really received an answer, other than call out time is 2hrs! and if you cannot handle it do not come.
I would venture that not unlike Qatar and many operations throughout the M.E.
it comes down to plan and simple " servitude" and your willingness to accept such horrid terms.