2 days, 2 weeks or longer?

So the C2C can be done in a couple of days (see below), but here is a more normal itinerary, this one offered by one holiday company at:

http://www.mtsobek.com/mts/ECC

Walking England Coast-to-Coast

• Day 1 - Meet in Penrith, England, and transfer to St. Bees, a historic town dating from A.D. 650.
• Days 2-6 - Begin the hike, heading inland along the lakes and fells of the Lake District. Pass through Grasmere, Patterdale Valley, Lake Ullswater, and Kidsty Pike, at 2,558 feet the highest point of the walk.
• Days 7-11 - Cross a limestone plateau interspersed with ancient stone circles, burial mounds, and prehistoric settlements. Continue through the Pennine Chain and the scenic Yorkshire Dales National Park, where little stone built villages nestle by streams on the valley floors.
• Days 12-14 - Traverse the North Yorkshire Moors National Park past the Cleveland Hills, the scarp cliffs of Hasty Bank, and on through Glaisdale High Moor to Glaisdale and the river Esk.
• Days 15-16 - End the hike at Robin Hood's Bay on the North Sea, with a welcome ritual bathing of the feet! Depart on Day 16.