Duration is so overrated. How long does it really snow 1"/hr+ at a given locale in any given storm? Its much more about atmospheric water/dynamics/rates....stalled storms may add a few inches, but occlusion normally ensures its that "days and days of snow" crap that adds like 2-3" per day.
Ideally, you get a storm go to go nuts with insane rate, stall and then get captured by another piece of energy diving in, but that is pretty exotic due to wave spacing issues.