Bob
The gash was 83ft long but the ship wasn't beached for the repair.
A brief look on the tinternet revealed the following:
It was discovered that the rock had opened a gash in the ship's outer hull over 9 feet (2.7 m) wide and 83 feet (25 m) long, perhaps 60 times the area of the RMS Titanic's damage. The enormous size of Great Eastern precluded the use of any drydock repair facility in the US, and the brothers Henry and Edward S. Renwick devised a daring plan to build a watertight, 104 feet (32 m) by 15 feet (4.6 m) caisson to cover the gash, held in place by chains around the ship's hull. The brothers claimed that it would take two weeks to complete the repairs and said that they would only take payment if successful. However, the demands of the American Civil War caused delays in getting the iron plates required, and instead of two weeks the repairs took three months at a cost to the company of £70,000. The ship finally sailed from New York for Liverpool on the 6th of January 1863.
We have been discussing the value of accurate research on the Claughton thread. lol
Paul