How long should you work before taking a break? The typical recommendations I see in the blogosphere are (a) every 50-60 minutes and (b) every 90 minutes. My advice: take breaks when you actually need them rather than taking them on schedule.
Be careful with advice given by writers. It may not be wrong, but it may very well be domain-specific. In other words, a clerk in a copy store can probably work two or three times as long as a writer without needing a break. A construction worker may only be able to optimally work half as long. Think about the nature of the work you do and learn to rightsize your breaks accordingly.
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