I've worked at startups with open plans for the past 12 years. At every one, it starts out ok when there are less than 10 people. As soon as there's about 20, a

I've worked at startups with open plans for the past 12 years. At every one, it starts out ok when there are less than 10 people. As soon as there's about 20, almost all of the important programming work is done after hours when all the loud people are no longer there. The only thing that gets done during the day (programming wise) is putting out fires. I've come to the conclusion that half the reason startups require "insane hours" is because during the day, the programmers are distracted and only working at 20% capacity.