From the perspective of a test developer, there is great variability with respect to time and effort needed to prepare a test. 70-519 / 70-528 / 70-693 / 70-272 / 70-299 / 70-403 / 70-561 / 70-671 Likewise, from the perspective of a test taker, there is also great variability with respect to the time and needed to obtain a desired grade or score on any given test.