You can't estimate, assess, unknowable unknowns when foundation is still under construction #software
For me, it's been reliably about 30% for years, so I estimate based on what I know, adjust for what I reasonably predict, then add 30%. 
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For me, it's been reliably about 30% for years, so I estimate based on what I know, adjust for what I reasonably predict, then add 30%. 