The book The Mythical Man-Month by Frederick Brooks is an insight into the relationship between time, energy and productivity.
When examining the prospect of adding more hands into a project, it is more complex consideration then the concept of: more people equal more work.
More hands on deck does not always equal more output. The complex balance of skill, timing, physical output on the tangible side have a balance. However, the creative thought processes are not measurable by hours or people. You can’t order “2 hours of creativity” from Amazon with free shipping. Creativity is a process that is motivated by external input and personal interpretation.
The process of determining the time frame or expense of a project is as multi-faceted as the project itself or the people involved in it.
When watching the Olympics and you witness a “gifted” athlete who displays talents that make their performance appear effortless – the hours, people, expense, sacrifice and time invested in that outcome do not equal the moment in the sun (for us) any more than the great works of DiVinci are reflected in each creation.
When you are planning a project, take some of the points in the works of Mr. Brooks into consideration. Your expectations will have a better foundation and more realistic opportunity for success.