John Carmack has written something about being super-productive in a fixed chunk of time.
But I can see where your coming from. After certain set (~5) of being super-productive, you burn out. And you just can't take it any more.
At these times it is best to take a break and do something different. I've found that these breaks (~1 to 2 hours) tend to make you more productive in your next chunk. (Rather than being burn out and weary.) It gives you time to think and churn ideas for what you will do next.
Lastly I want to add; knowing what you want to do next makes a difference. When you know exactly what you want to do (the spec), you naturally are about implementing it - when not knowing the spec, you're figuring things our as you go and that slows you down. In addition it's always better to sit down and gives additional exclusive time to thinking of your program rather than figuring things out as you go.
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John Carmack has written something about being super-productive in a fixed chunk of time.
But I can see where your coming from. After certain set (~5) of being super-productive, you burn out. And you just can't take it any more.
At these times it is best to take a break and do something different. I've found that these breaks (~1 to 2 hours) tend to make you more productive in your next chunk. (Rather than being burn out and weary.) It gives you time to think and churn ideas for what you will do next.
Lastly I want to add; knowing what you want to do next makes a difference. When you know exactly what you want to do (the spec), you naturally are about implementing it - when not knowing the spec, you're figuring things our as you go and that slows you down. In addition it's always better to sit down and gives additional exclusive time to thinking of your program rather than figuring things out as you go.