Manday for Web Pentest

Dear list,

Would you able to share with me how you estimate the efford (man-day) for a web pentest project?
Previously, I quoted manday based on number of pages, number of functions, criticalness of transaction,.... Each project normally take about 3 to 6 mandays. I want to formalize the efford estimation for WebPT. Any suggestion is appreciated.

Thanks

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