Keep it a short as possible, I'd say definitely no longer than a second. But what details you'll record depends a little on the seeing too. Also, I think the biggest challenge is to record stuff like Jupiter's moons and not lose the phase of Venus to overexposure in the same image. The difference in brightness is considerable. If conditions are good, consider an exposure series that could be made into an HDR type composite later.
In any case, take a few test shots & review them on the 60D's monitor by zooming all the way in. That'll give you a pretty good indication of what you are achieving.
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