[B7L] Speed freaks?

I have a feeling there isn't an answer, so am inviting speculation and ideas and pure guesses ...

how fast *is* 'standard' speed? Not as set-in-concrete terms, but, say, as a believable general idea one could use to build a story around, were one building it around a journey between planets. I mean, the time it takes them to go from one place to the other (including trips supposedly half-way across the galaxy!) varies all over the place on-screen. Are there any particular episodes you'd give more weight to as evidence than others?

Any takers?

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