Are 10-11 Hour Programming Days Feasible?

"My current boss asked me what I thought of asking all employees to work 10-11 hour days until the company is profitable. He read something from Joel Spolsky that said the best way to get new customers is to add new features. Anyways, we are a startup with almost a year live. None of the employees have ownership/stock and all are salary. Salaries are at normal industry rates. What should I say to him when we talk about this again?" via Are 10-11 Hour Programming Days Feasible? - Slashdot.