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Hi Shiva, I'm attaching with this comment a post which contains all the details for planning this detail and a perfect itinerary to plan this trip.
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If you wanna go there for mountain trekking then my iternerary may help. Going in month of February would be the best time for Langtang Trek.
https://www.tripoto.com/trip/langtang-trek-to-heaven-5baf5e7b57c88?source=afb
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This seems really helpful...thanks