11:45 min possible duty time for 4 sectors...more than enough time!!!
Obviously if people are on SBY duty only then that would be better, but i thought the whole point of your initial post was SBY BEFORE duty?
The key to crewing is to produce as few roster changes as possible, but if the SBY's arent there what do you suggest? Sometimes a bit of imagination is called for, and that means disruption for you and your crew.
If the operation went to plan all the time wouldnt it be boring....