I'm not disciplined in terms of scheduling. I work best late at night, but I can't do that when I'm on a TV show - our hours are roughly 10-6:30, so I have to go to sleep at a reasonable hour. So I'll sometimes write fiction for an hour or two in the evenings, or several hours on the weekend afternoons - unless I'm actively writing a script for the show I'm working on, in which case there's no time to write fiction at all.
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