Final answer:
The average duration allowed for public review and comment is 45 days, falling into the range of 30 to 60 days based on historical averages discussed by Willcocks.
Step-by-step explanation:
The duration allowed for public review and comment can vary depending on the context and specific regulatory or legislative processes involved. However, referring to the average time reported by Willcocks (1913), we understand that the average duration for a public review and comment period is 45 days. This aligns with the first option provided, which is 30 to 60 days.
It's important to note that this duration may differ based on the jurisdiction, and the specifics of the case, as other durations are given in various instances. For example, the signature collection period in the context of state ballot measures can range from 150 days in a state like California to as long as two years in Arizona, but this is a separate procedure from general public comment periods.