Local sublimation lifetimes and sublimation distances of icy grains. Top: local sublimation timescale τ_loc for grains with a₀ = 1, 5, and 10 μm. Horizontal dashed lines mark 1 day, 1 month, and 1 yr. Bottom: corresponding sublimation distance. Filled symbols show the destruction-length measurements, while the open symbol marks the measurement with a larger inferred scale and larger uncertainty.