How many days is a reasonable time limit; conducting the assessment over a longer period of time might jeopardize the quality of the information?

The correct answer is 30 days.

Thirty days is a reasonable time limit.  Conducting the assessment over a longer period of time might jeopardize the quality of the information.

When conducting an assessment on climate, one month is a reasonable time to study the facts and the result of the assessment. More days implies a risk in the veracity of the information obtained. The circumstances and variables might change due to the different conditions taken in consideration while running the first assessment.