Hope this answers your question.
Yes Vagrant, it very well answers my question !!
A very similar question was asked on a popular trekking forum & a friend Ashutosh answered it aptly as under :
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There are no standard definition of trek here because a trek can become longer or shorter and thereby add degrees of difficulty. The same trek done in summer and winter can have various degrees of difficulty. A trek done 100 years back and done today have entirely different degrees of difficulty. A trek can also be rendered difficult by the fact that whether its frequented by trekkers or not!! From that point of view a trek into the inner sanctuaries of Trimukhi Parvat can be several degrees more difficult compared to Kalindikhal may be..where at least the terrain is well explored and the danger points known more or less. The terrain adds its own challenges- do I compare a Auden's Col with Chadar Trek in winter at Zanskar?
There are such examples as of Late Sir Francis Younghusband crossing the Mustagh Pass into Yarkund in the face of robber tribes before the advent of the 20th Century. Similarly you have more recent examples of Col Kohli's team traversing the entire breadth of Greater Himalaya from Karakoram to Lipulekh Pass crossing over 52 Passes between December to February of 1998, well chronicled in the book "Across the Frozen Himalayas"!! Not to speak of the several exploratory treks of Shipton and Tillman all through the 3rd and 4th decade of the 20th century. Those were the toughest accounting for all dimensions!!! You hardly see treks of that magnitude being organised or executed that frequently.
A discussion might ensue if all those criteria can be scoped in the question- Season, duration, length, popular, altitude etc. Otherwise one may not be doing a like to like comparison.
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I have nothing more to say !!
