Now, the class ran 10 weeks, and in the end, about half of the 160,000 students watched at least one video each week, and over 20,000 finished all the homework, putting in 50 to 100 hours.
El curso duró 10 semanas y al final, cerca de la mitad de los 160 000 estudiantes vieron al menos un video por semana, y más de 20 000 terminaron todas las tareas