George......thanks for "opening your trench coat" to expose this topic! I have the following info in my Addendum, modified as necessary per the assignment:
DISCUSSION OF EXPOSURE TIME and MARKETING TIME:
The Opinion of Value in this report is linked to the appraiser's opinion of Exposure Time. Per USPAP Std. 1, the opinion of Exposure Time is always presumed to precede the effective date of the appraisal. This is the estimated length of time the Subject property would have been offered on the market prior to the hypothetical consummation of a sale at market value on the effective date, assuming a competitive and open market. Development of this opinion can be a range based on a) statistical information about days on market; b) information gathered through sales verification; and c) interviews of market participants. Comparable sales and listing CDOM information was entered on the sales grid. Based on that info, the range of Exposure Time is to days, with the appraiser's ET opinion placed approximately at the low end ***mid point ***high end of the range.
Marketing Time is an opinion of the amount of time it might take to sell the Subject property at the concluded market value during a period immediately after the effective date of the appraisal, and can be expressed in a range. In addition to items a) - c) above, it also includes analysis of anticipated changes in market conditions. It is a function of price, time, use and anticipated market conditions. Based on this, an opinion of Marketing Time range is noted on the check box in the Neighborhood section of the 1004 Form.
When reviewing reports, I often see appraisers report a specific number of days as the Marketing time in their comments. I choose not to do that, and use the 'range' statement available on the form to be the reported length of time.