Getting to class can take a big time because it is the rush period.

去学校会花很久，因为正好是上班高峰期。

And it takes a long time because it is the rush period — but the usual expression is the rush hour.

时间花很久是因为“rush period”，但是通常表达应该是“rush hour”。

And it takes a long time because it is the rush period – but the usual expression is the rush hour.

而且它花了很长时间，因为这是高峰期，但通常的表达方式是高峰期。