Throughout the course or duration of (a period of time).
During the summer she worked as a waitress.
The students remained attentive during the entire lecture, taking notes and asking questions.
The storm raged on during the night, with thunder echoing through the darkened sky.
The restaurant experienced a high level of activity and buzz during the lunch rush.
The athlete maintained focus and determination during the marathon, crossing the finish line with a sense of accomplishment.