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I pretty much have lived my life in hiking boots. Too many factors to consider as far as your gait and the varied terrain to give you a specific answer. The soles are something like vibram's 2nd rated most long wearing. To get longer wearing you give up some shock absorption, and choose a heavier boot. It's also going to depend on what you wear for an insole or if you wear a custom made orthodic. Considering he out-sole and mid-sole are replaceable, and the entire shoe made in a durable manner that can be rebuilt, either by Danner or a qualified cobbler, if you keep the boots maintained they have the potential for a life span longer than either of ours. The only folks that have been displeased with these boots have either not accounted for a break in period, have not ordered the proper size allowing for room for toes going back down hill, or failed to have the shoe laced properly or with the proper fitting insole to keep their heel properly and firmly seated in the shoe. I am no expert, but I have a lot of personal experience and these are just my opinions. The good qualities I noted are not exclusive to these boots, others either by Danner or a number of good quality boot makers are suitable for your trek. However, this is only part of preparation for such a trip and I urge you to better familiarize yourself with what this trek requires both in terms preparation of equipment and yourself. Best of luck. Live long and perspire!