Okay look I just spent a whole lot of time making a good review just to I guess it was my fault but the page went back and it erased my review and since im sick right now and just want to lay down here you go. The 660 is a beast to be reckoned with, not only does it works just continuously but it has a beautiful design about it that other fans don't have. It works wonders and makes air just BILLOW out of it (sometimes I even use it to clear rooms by holding it and using it as a slightly portable fan and making sure all the air in the room gets moved. and for a normal room it takes about 30 seconds and for a living room about 40. Oh heres a bad thing about it I dislike the chrome bar, I just feel like sometimes its just too hard to swivel the model but if you give it just like 3 extra seconds of patience you can get it to move. okay there you go bye