Prayer: If a commuter travels under the shar‘ī distance from work and returns the same day, does he still pray full?

Practical Laws of Islam as per the teachings of Imam Khamenei

Prayer: If a commuter travels under the shar‘ī distance from work and returns the same day, does he still pray full?

English:

Question #664:

One who travels to and fro between his place of residence and work — they are far from each other by more than 20/5 km — must perform prayers in full. Will his prayers remain full-length if he leaves the city of work and travels less than the shar‘ī distance, whether to another city or not, and then returns to his place of work before or after noontime?

Answer #664:

The rule of one’s prayers and fasting in the place of work does not change simply on leaving it for a place within the shar‘ī distance, even for a purpose not related to the daily work, regardless of whether one returns to the place of work before or after the noon.

-Imam Khamenei, Practical Laws of Islam, Importance and Conditions of Prayer