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From First, the usual lake-and-back walk takes around two walking hours and includes uphill stretches. Add the gondola journey, stops and a lakeside break. The reflections depend on clear, calm weather; they are not a reason to rush or leave the marked path.
Check the official trail status and last gondola before departing. An operating lift does not mean every path is open. Wear shoes with grip and carry water, food and layers. Continuing towards Faulhorn or another station changes the outing substantially; choose that route in advance.