I know some people will find themselves between categories and also that sometimes durations vary. However, pick the one that you think is truest for you overall. eg. My symptoms are mostly gone 6 days or so after O but I generally feel even more alert and more myself after more than 10 days. Also in the first couple of years of me developing POIS, my symptoms used to last much longer (one month) than they presently do. Nonetheless I put 5-7days for me because it seems to best reflect my experience now and over the last few of years.