Final answer:
A professional or business walkthrough should generally not exceed two hours to maintain participants' focus and productivity.
Step-by-step explanation:
From the context provided, it seems the student is asking about the duration of a walkthrough in a professional or business context, such as a project review or software demo. A general guideline for such walkthroughs is that they should be kept concise to maintain focus and efficiency. Best practices suggest a walkthrough should last no longer than two hours. This is because extended meetings can lead to diminished attention and diminished returns in productivity. If a walkthrough takes longer, it is usually a good idea to schedule breaks or split the content into multiple sessions.
If we are talking in terms of software engineering or technical project management, a code walkthrough or a design walkthrough for instance, similarly advises keeping the session under two hours for the sake of effectiveness. The provided information does not give an exact duration for the walkthrough, but it does indicate a very long travel time of nearly eight hours to reach a destination called Spiral Jetty, which appears unrelated to the duration of the walkthrough itself.