lay days

noun

1. Commerce. one of a certain number of days allowed by a charter party for loading or unloading a vessel without demurrage.
2. Nautical. a day in which a vessel is delayed in port.

pl n

1. commerce the number of days permitted for the loading or unloading of a ship without payment of demurrage
2. nautical the time during which a ship is kept from sailing because of loading, bad weather, etc