A project consists of four activities with information as shown in the table. What is the overall variance of the project's duration? 
Definitions:
Puffery
The use of exaggerated or vague statements in advertising or sales that are subjective and not expected to be taken literally, used to create appeal without making concrete claims.
Sales Presentation
A pitch or communication aimed at convincing potential buyers to purchase a product by highlighting its benefits and value.
Visual Aid
An item of illustrative matter, such as a film, slide, or model, designed to supplement written or spoken information so that it can be understood more easily.
Actual Product
The tangible good or service offered to customers, encompassing its features, quality, branding, and packaging.
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