09 Apr 2021 / 15:35 H. * Giant ship stuck for more than two days * Two marine rescue firms to help refloat effort * Shipping backed up either end of canal (Adds comment on latest efforts) By Yusri Mohamed, Gavin Maguire and Florence Tan ISMAILIA, Egypt March 25 (Reuters) - A container ship blocking the Suez Canal like a "beached whale" may take weeks to free, the salvage company said, as officials stopped all ships entering the channel on Thursday in a new setback for global trade. The 400 m (430 yard) Ever Given, almost as long as the Empire State Building is high, is blocking transit in both directions through one of the world's busiest shipping channels for oil and grain and other trade linking Asia and Europe.