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Season duck generously with salt and pepper. For best results, place on a plate and refrigerate uncovered overnight before proceeding.
Seal duck in vacuum bags. Place in 130°F (54°C) water bath for at least 45 minutes and up to 4 hours. Remove from bags and dry thoroughly with paper towels.
Place breasts skin side-down in heavy-bottomed 12-inch non-stick or cast iron skillet and set over high heat until sizzling, about 2 minutes. Reduce heat to medium and cook, moving and pressing breasts to ensure good contact between skin and pan until golden brown and crisp, about 5 minutes. Flip and cook second side until barely colored, about 30 seconds. Transfer to paper towel-lined plate and allow to rest for 5 minutes.
Slice breasts crosswise into 1/2-inch strips and serve.