[acrooks]

It’s because LNG ships are cannibals.

Due to the nature of LNG storage, a small amount of the gas “boils off” every day (fraction of a %). The longer a voyage, the more cargo is lost. So LNG carriers are incentivised to deliver cargo as quickly as possible so they can maximise the delivered value of the goods.

(Fortunately because these ships themselves are LNG powered, they are designed to recapture this boiled off fuel to operate the vessel)