Weather working day

A WWD is a laytime unit of 24 hours during which cargo work could proceed, with time lost to weather excluded from the count. The convention stops the laytime clock when rain, wind, or sea state prevents loading or discharging, so the charterer is not penalized for delays it cannot control. Variants such as weather working day of 24 consecutive hours and the SHEX (Sundays and holidays excepted) qualifier change exactly how the clock runs.