Six months to Tie 150 flies is still less than one fly a day it even allows some time for shipping. Tie seven in a day take the week off. I am willing to bet that most of us have the stuff we would need already and them some. It boils down to choosing a pattern you are comfortable with. I do agree that trying to get 100 strangers to meet a deadline will be the hard part but are world records supposed to be easy?