Depending on the tests performed, a standard certification of a Class II, Type A1 or A2 BSC will generally take approximately 45 minutes to 1 hour. A standard certification of any Class II, Type B1, B2, or A2-Exhausted BSC will generally take approximately 1.25 to 1.75 hours. Additional time would be required to perform a degradation inspection, cabinet integrity test, decontamination or other maintenance.