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The O2 is a dome theatre/stadium in London, UK. It looks like a dome with poles sticking out of it. How long can this unusual structure last?

1 year: The first wire begins to bend, and a pole leans 2 degrees.

10 years: The Thames batters the soil, and the peninsula landslides slowly, and the first pole falls down damaging the dome and other poles/wires.

25 years: O2's poles are wires all fell down, but the dome is only 20-30% destroyed. The dome remains as the peninsula slides into the Thames.

45 Years: The Greenwich Peninsular becomes a bog once more.

100 years: The rusty dome finally collapses.