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No overnight bookings at all — a one-day park ticket and a return bus (CLP 28,000, ≈ €25). You see the park's headline viewpoints, and the full walk to the base of the towers is a long single day with an early start and fixed trail hours — check the current entry cutoff when you buy your ticket. The trade-off is time on the bus each day and none of the park's interior. By a wide margin the cheapest way in, and the only one that doesn't depend on winning the booking race.
The classic, and what most people mean by "doing Torres del Paine": the Grey Glacier, the French Valley and the base of the towers, linked by refugios and campsites the whole way. It can be walked in either direction, it needs no technical experience, and every night can be a bed with meals if you pay for it. The cost page breaks down what that choice is worth.
The W plus the park's remote back side: about 131km in total, walked counterclockwise only. The extra days add Serón, Dickson and Los Perros — the last the most basic site on the circuit — and the John Gardner Pass, the most demanding and most wind-exposed climb in the park. Fewer people, more solitude, and three to four more nights of beds, food and bookings on top of everything the W already costs.
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Time decides this more than fitness. The W is well serviced; the O is a indeed the bigger commitment, not the W with a few extra days.
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Guides for Torres del Paine planning — real costs, route comparisons, and booking links.