Is it better to spend 5 days developing a 90% accurate solution, or 10 days for 100% accuracy?

Is it better to spend 5 days developing a 90% accurate solution, or 10 days for 100% accuracy? 


Depends on the context?
-"premature optimization is the root of all evils"
-At the beginning: quick-and-dirty model is better
-Optimization later

Other answer:
- Depends on the context
- Is error acceptable? Fraud detection, quality assurance

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