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Unlike Torres del Paine, there's no trail-permit race. You buy the park fee per entry, online or at the portal, and walk. That's the good news.
Fitz Roy is cloud-free on only about one day in five. The trip that sees it is the one that stays long enough: plan four or five nights, ideally a week, rather than a two-night stop.
Guides for El Chaltén and Los Glaciares planning — real costs, route comparisons, and booking links.