Hop flavor is such a big part of a IPA and it will loose it fairly fast. Most are probably going downhill after a month or two. I can taste it fading away week by week. After it's carbed your better of putting them somewhere cooler than 70 if you plane on keeping them around long. Most everything I read suggest one week will do. Papazian said 7-14 days. Palmer said one week often will do the job. Nothing wrong with three but depending on a lot of other factors it could be unnecessary. If you don't taste one you'll never know.