I was told the strechy band thing, I called it my girdle, lol...was for you comfort. So you can wear it for as long or as little as you want. I found it helped alot while trying to sleep. I had alot of gas pain in my chest and port pain. That is probably what you are feeling under your breasts. Im 2 weeks post op and it is mostly gone now. However I still do get some pain in the port area here and there.
Hang in there...it gets better!