How much drift can I expect to see from the gyroscope if I have the magnetometer disabled?

The raw drift on the gyroscope is rated by the manufacturer as 11º/hour, but we have seen it drift at about .92º/minute (55.2º/hour). Some of our sensors have been upgraded to have an improved gyroscope, which is rated for a drift of 1.5º/hour. Upgraded sensors currently include the wireless, embedded, Bluetooth, and data-logging models.