With seven multiple-choice subtests to complete, the ASTB-E will take candidates 2-3 hours to complete, with the OAR alone taking 1.5-2 hours. This time frame excludes the Biographical Inventory with Response Verification, which is completed at home. When taking the online version, the first five subtests of the exam are computer-adaptive, meaning that the subtests adapt to your skill level as you answer questions.