Can the trek be shortened by a day or two?
This varies from trek to trek. Our high altitude trek itineraries are designed keeping in mind the acclimatization process. We would strongly advise you against shortening your itinerary.
Write firstname.lastname@example.org about it. We will tell you if it is feasible on the trek you are going to.
Can you tweak the itinerary according to my dates?
If you are joining one of our pre running batches then you will have to stick to the itinerary on the website. The itinerary cannot be tweaked. For a group of 15+ trekkers we can organise a custom batch with a new itinerary.