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I'd say a little break works just fine; 30 minutes elsewhere, whether it be going for lunch somewhere or a little power nap. If I know that it's going to be a long day ahead, and I need to be at the top of my game, then that little power nap and a cup of coffee or tea surely do help me stay in form.

Top-of-game status is where it's at for sure, but we all need to recharge too.

My recharge sessions are with friends or family, a weekend hangout does the job. Even a post-office coffee break is quite therapeutic.