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Does it ever say?
cbingham: Does it ever say?
I don't think there's an official answer, but IIRC, Roger Wilco has a few different ideas throughout SQ3 (ranging from a thousand years to a thousand minutes).
The other characters he runs into in the later titles remember him as the one who thwarted the Sariens "some years back". The wording used seems to imply a reasonably short amount of time.