For example:
# Start timelapse at 07:30 CST (12:30 UTC)
30 12 * * * systemctl start timelapse
# End timelapse at 22:00 CST (03:00 UTC)
00 3 * * * systemctl stop timelapse
I'm also looking into the best way to, after the timelapse completes, automatically upload the series somewhere for faster processing. Might just set up an FTP server and have an FTP command in another crontab entry.