In An Extraordinary Man (and its sequel) by Chris Carr, Clark is a DA. The sequel is especially delightful.

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Originally posted by IolantheAlias:
"Lifeflight" was quite a good fic, as I recall. And Clark does face some of the problems involved with "running out".

SPOILER WARNING (actually, I'm not sure it's a big spoiler, but just in case)

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I believe that in the fic he's primarily a research doctor who picks up some shifts in the emergency department, so his schedule is irregular to begin with, which helps.
Also...

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He can blame sudden exits on his pager. Which I thought was a neat idea. Great story. Reread it recently.