Hi Warmup,
Fast turnarounds combine the urgency of a close finish line with the stress of doing adequate work. Key for me is trimming my attention to what I need to do, and doing it. When there's time I rough in something, take a short break, and polish, proof, send.

This calls for the skill of ignoring. With mindfulness getting big press, and 'denying' being almost an insult, it's not surprise that denial's cousin, ignore, gets little praise. Ignore is a step closer to attention and action than denying, for me. All of this is for me as I'm not writing to set a big theory or win any prizes.

But with everything, a good search will find a blog to the point. For example, this one on Medium.
To the page,
Revu2