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Do you not stop during those 36 hours?
Don’t think I’ve ever heard of a 36 hour journey without any form of rest.
Exactly, who the hell hikes for 36hrs straight without stopping, 60hrs with the battery saver. And if your going on a long trip your bound to have a battery backup or somewhere to plug it in. Take a rest for 40mins and the watch will be close to full anyway.
Also with normal usage I get 24hrs to 30hrs easily without any battery saving features turned on, AOD on and all features on my Series 7, so going by that usage my usage should be able to squeeze 2.5 to 3 days out of that ultra which is plenty.