Striking the right balance between maintaining the software quality and taking care of the release date is one of the many challenges that we partake in the software development life cycle. As a result, it becomes extremely necessary in building the right test cases to address and resort to addressing the product risk with the adjoined test case. While this is standard practice and should be given the maximum value, dissecting each requirement with the test case will seemingly postpone the end date of delivery and subsequent launch of the product. This is where proper planning comes into action. Estimating the testing time takes proper planning and treating the SDLC as a puzzle, wherein you will have to compartmentalize each part of the puzzle and think it directly in terms of testing.
Planning makes it feasible to utilize the already available resources to the best of your capabilities and also helps in predicting your long-terms as well as short-term project goals. The closer and accurate your planning data turns out to be the closer you are going to get to higher quality project management.