Number of tasks
The number of tasks in a study can vary greatly depending on the predefined session duration and the length and complexity of the tasks.
Stakeholders may project the amount of time it should take a user to complete a set of tasks. However, they typically don't account for session setup and teardown time, nor the post-task or post-session survey questions. Their expectation of the time needed to complete a task may also be skewed because they might be basing it on the time it would take them, which is usually the time an expert user would take rather than a novice user, since the stakeholders work closely with the product. Time can also be different for someone who runs through the task in a test setting (merely clicking through) ...
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