How much buffer do people leave for weather delays on a Vinson trip, going in and coming out?
How many spare days should I leave for the weather on Vinson?
More than you think, at both ends: the flights only go when the weather allows, and delays of days are normal. Arrive in Punta Arenas early and leave spare days after the planned finish.
The full answer, kept up to date: How many spare days should I plan for weather on Vinson? The guide chapter: The waiting game