If you're expecting batch editing to magically transform all you pictures in one go you'll be sadly disappointed. By definition, batch editing means applying the same setting to all pictures. I can say with confidence that all 600 pictures will not look good with the same setting applied. Yes, you can apply some simple non-invasive adjustment to the entire batch - sharpness, a bit of saturation, a touch of extra exposure etc, but you'll still find yourself going through them all and tweaking individually.
Here's what I do. First picture - adjust as required. Select Copy at bottom of LH pane. Make sure all boxes ticked as required. Select next picture then Paste, which applies all the previous settings. If it looks ok, export jpg with a name change ["export as previous" from the drop down menu], move on and repeat. If I find myself having to make the same further adjustments after pasting, perhaps because photo conditions have changed, I update the Copy. Usually sharpness and some other settings remain the same throughout - just the obvious exposure etc being tweaked. It's relatively quick for me, and I do hundreds at a time.
Dust spots are a different matter. If you have a lot of dusty work to do, the copy/paste works well with skies but you need to examine each picture carefully to ensure that, for example, a dust spot clone on a sky hasn't messed up a subsequent picture where it is no longer sky in that position. Even the skies need to be checked because sometimes the dust spot clones don't paste over very well.