"For an attack like this, it was meticulously planned, it didn't happen overnight, it involved hours of surveillance and a great deal of planning to comply with the rules of engagement that we set that there should be no civilian casualties or other damage.
It has been argued that relocation, which often involves hours of helicopter mustering, would be more traumatic for the horses.
So the book on the twin towers, while it relies in many ways on typical academic sources -- newspaper clippings, government documents, engineering drawings -- also involves hours of interviews and plenty of walk-throughs.
A typical day for a pupil in Singapore involves hours of intense private tuition late into the evening.
This ritual of autumn involves hours of back-breaking bending, lifting, shoveling and getting wet, followed by many ibuprofen, a long, hot soak in the tub and a vow never to do it again.
Digital technologies also can almost certainly improve the burdensome client intake process, which at most treatment centers typically involves hours of paper-and-pencil questionnaires and forms that may or may not be transferred to an electronic health record (EHR).
"It involved hours and hours of work, combing cellphone records," he said.
