This is the standard documented mountaineering ascent of Piz Lischana from the Lischana Hut area. It is an alpine route rather than a pure hiking trail, with easy scrambling on rocky terrain near the summit. The route is generally considered the normal way to the top and is usually done from the hut as a day ascent. Objective hazards are typical high-mountain ones, including loose rock and possible snow or ice early in the season. The difficulty is modest but requires surefootedness and comfort on exposed alpine ground. I am not confident enough to provide a verified grade, distance, or timing figure without risking fabrication.
