From the perspective of a test developer, there is great variability with respect to time and effort needed to prepare a test. 70-330 / 77-605 / 70-121 / 70-222 / 70-230 / 70-310 / 70-340 / 70-691 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.