时段 (shí duàn): time interval; work shift; time slot; the twelve two-hour divisions of the day

Every morning from six to eight, the subway is packed with people rushing to work.

The supermarket offers discounts between eight and ten at night, so many customers wait until then to shop.

The doctor suggested I exercise between three and five in the afternoon, because the air is better then.

The Spring Festival period is a peak time for travel; flights and hotels are much more expensive than usual.