Large volcanic eruptions can inject teragrams of sulfur dioxide (SO₂) into the stratosphere, influencing stratospheric chemistry and Earth's climate. This work calculates decay timescales of volcanic gas-phase SO₂ in the stratosphere using data from three satellite products. SO₂ decay timescales vary significantly between the different products, and this uncertainty limits our ability to attribute an observed SO₂ decay following an eruption to a specific chemical process.