itwbennett writes "They'll still be all-night coding sessions, but starting with this week's 'Project Mayhem' event, there are a few notable changes. First, they're longer — starting at 11 a.m. Thursday and continuing until 2 p.m. Friday. And coding through the night is optional. 'It's like, "let's take this day off to do this, and then if I need to get more done, we can hang out and finish at night,"' said Facebook engineering manager Pedram Keyani, who organizes the hackathons."