My experience is 90 days. If comps in the area are rare or of an unusual nature, I've had appraisers go back 180 days but first they extend their normal range or distance. I had one not long ago jump a natural barrier because of lack of comparables to mine. But, it depends on luck of the draw now days on the appraiser you draw.
If it's signficate and it's in the budget, hire your own and that might help with the bank's appraiser.
