Final answer:
The main difference between effort estimation and time estimation is that time estimation includes stakeholder time.
Step-by-step explanation:
The main difference between effort estimation and time estimation is that time estimation includes stakeholder time. Effort estimation refers to estimating the amount of work or effort required to complete a task, while time estimation focuses on estimating the amount of time it will take to complete a task.
For example, in a software development project, effort estimation may involve estimating the number of hours or days it will take for a developer to write code, while time estimation may include accounting for the time needed for stakeholders to review and provide feedback on the code.