[paradox460]

Infinitely long. You can't trick me with the coast paradox

[_ache_]

Actually ... Not infinitely long. You wont have a precise value since each measure can be increased by taking a smaller "step" or "ruler", but it won't be infinite.

[saghm]

Unbounded, at least. If you give me a measurement, I can give you a larger one that's more precise.

[theodric]

This guy* Mandelbrots

*presumably, but maybe not