The "w" trek is considered a nice option for those who haven´t got much time available and want to see the most important parts of the park. I´m not a trekking expert =P and I could not complete the whole trek because of the weather, but I will write down the data I´ve collected about this circuit.
It usually takes from 4 to 5 days, depending on weather and speed, covering a journey to Torres and their base, contouring the mountain Chico Sur and the cuernos, then walking along the Valley of Francés and coming back to reach the Grey Glacier (the Grey Glacier, this valley and Torres are known as the most beautiful parts of the park). This walk then has the form of a W... Some people start from the Torres side, walking since laguna Amarga (or you can pay for a microvan to get to refugio las Torres and then start from there), and some others start on the Grey side, from Pudeto´s bus stop and taking a boat to Pehoe Camping.
There´s a nice description of this circuit here:
http://www.ijs.si/people/mark/to
rres-del-paine-W-trek.html
Just one detail: the cuernos refuge, that was in construction when that text was made, is already in function, and there is a camping as well.
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Website: http://www.footadventure.co.uk/mapsamer/chiletorres.html