[AndrewC]

But, assuming there's liquid water, either there's life, or there's several million years worth of Urey-Miller type reactions.

Consider these things

1. The energy density in the M/E experiment.
2. The resulting concentrations of the by-products of each and every zap of electricity.
3. The beginning concentrations of the reactants subject to the coming zap of energy.
4. The time involved in producing a soup of concentration X.
5. Consider the above values in relation to a planet with an atmosphere and an ocean.

How do the two relate? Is it just a difference in time? Or is there a possibility that completely different chemicals will be produced. Or is it possible that other chemical reactions might prevent a soup from being formed?

[Virginia-American]

No-one knows, we just have to await the exploration. IMO, it won't be too much longer until the next generation of telescopes demonstrates the presence of extra-terrestial life by observing an oxygen-rich atmosphere.