Sometimes the best gain is to loss.
 
The ship arrives at the port one day earlier than the loading date.

The wharf is available.

The operator orders the ship to wait at the anchorage.

This idea is natural based on economic rationality.

Docking one day earlier means you have to pay an extra one day berthing fee.

But the crew can go ashore and rest if taking berth one day earlier.

Try making your own continuation of this story.