Indeed, we find life practically everywhere on Earth and there's no telling what kinds of adaptations alien life might have to all sorts of seemingly inhospitable environments.
I think that's ceejayoz's point though. The less we know about something, the less confident we should be about declaring limits to when that something can occur.
Even environments that are energy-poor, or cold enough as to inhibit chemical reactions, may support rich forms of life that operate on larger time scales.