Avoid Working-When Too Tired
If you are too tired there is no point pushing further.
Being too tired is very subjective. Sometimes you will be able to go 12 hours and feel fine. Other times 8 hour day will wear you out.
Work in Flow/Work State, when you too tired this isn't flow state.
Note: On rare occasion it makes sense to make an exception and push through tiredness and work through it. However, this must be rare exception rather than a rule. Such push must be seen as a mistake that needs evaluated in retrospective and accounted for remedied in the future.
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