Combining the 3 pieces I've done so far and removing redundant footage*: 59m 43s
* I repeat part of the last scene in the next segment
Additional noticeable changes:
6. No damn midichlorians! Palpatine says "he could use the Force to create life" (jerky cut there, though)
7. Trimmed out as much as I could (not all unfortunately) of Obi-wan on the back of that damn lizard
8. Obi-wan only shoots Grievous once; I thought several shots was gratuitous
Still not sure what I want to do about the OPED. The working copies, warts and all, are 200 MB apiece and there are 3 of them.