True to a certain extent, I think. 90 days was the primary mission objective, and would have been achieved for the nearly-worst-case situation for panel dust collection. Everything else was massively overengineered against the 90-day objective because it was known that the level of dust collection might not be worst-case.
I doubt that anyone seriously thought they'd get away with it for this long, though.
icon: Go - and keep on going.