That's a tough one! One of my cases was a really complicated septic abdomen that was in hospital 6 days - the first time I wrote it up, I was three pages over! It took a lot of ruthless chopping to cut it down to size!
My best advice would be to focus mostly on the parts you were involved in, and your observations, especially if they changed or influenced the treatment plan at all. And also any procedures you personally did or were involved in.
What also really helped me was that I had a really good proof reader in one of the vets I worked with - if you can find someone like that, if you're fortunate to have someone like that around, it's a huge help!
Good luck!
Karen
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