I recently posed a question to the community over at Gearslutz.com about how many hours a day does their studio normally operate. Their answers echoed what I have come to know from friends and working throughout the industry. Most engineers seemed to echo somewhere between a 10-12 hour day being standard. While many also said they try to match the bands pace but they do have a limit as to how much they can take (18 hours being many peoples limit). This is useful information for bands shopping for studios and producers who think it is OK to charge bands high rates for a short day. Be informed!