Cartons arrive at a workstation via a roller conveyor spur at a Poisson rate of 30 per hour. The time required to process the carton at the workstation is exponentially distributed with a mean of 1.2 minutes. How long must the accumulation line be such that it will not be full more than 5% of the time? (Note: When the accumulation line is full, cartons are diverted to a separate accumulation area.)