"Usually sperm whales die fairly quickly after coming ashore but it could be 12 hours, it could be more."
Kieran Copeland, from the Hunstanton Sealife Sanctuary, which helped the rescue attempt, said possible internal injuries meant the whale was unlikely to survive.
"It is still alive at the moment but the prognosis is very poor. It is very unlikely to survive," he added.
It comes after three dead whales washed up on the Lincolnshire coast and one was found at Hunstanton last month. It is the 29th stranding across Europe in the last two weeks.