Here's a question: If 8 hour work days get maximal productivity out of a worker (according to several studies I've read through links made available on this boa

Here's a question: If 8 hour work days get maximal productivity out of a worker (according to several studies I've read through links made available on this board), and startups are all about getting the most out of their employees and getting ahead quickly, why are they all described as having long hours (one of the reasons it "sucks" to work at a startup) ?? I can understand if a very large organization has so much organizational overhead you somehow work really long hours, but for a smaller team that shouldn't be a factor ... right?