For our Beta Testing product we recommend 20 or less tasks & questions per test set for optimal results, depending on test requirements. The published test packages assume 45 min of active testing, but you can contact your BetaTesting representative to arrange more testing time if you need.
Our User Feedback and Usability Video products assume active engagement of 20 minutes and 15 minutes respectively. These tests are 10 - 12 tasks & questions max.