NEVER have content delivered to you as a spreadsheet, that has been edited by multiple people, and that contains links to files in dropbox.
if you want to do it right, it takes as long as it takes – basta!
don't try to be clever
"Programmers waste enormous amounts of time thinking about, or worrying about, the speed of noncritical parts of their programs, and these attempts at efficiency actually have a strong negative impact when debugging and maintenance are considered. We should forget about small efficiencies, say about 97% of the time: premature optimization is the root of all evil. Yet we should not pass up our opportunities in that critical 3%."Donald Knuth
"Programmers waste enormous amounts of time thinking about, or worrying about, the speed of noncritical parts of their programs, and these attempts at efficiency actually have a strong negative impact when debugging and maintenance are considered. We should forget about small efficiencies, say about 97% of the time: premature optimization is the root of all evil. Yet we should not pass up our opportunities in that critical 3%."
Donald Knuth
Don't document your code, code your documentation
premature optimization is the root of all evil