How long do you need to wear foam under compression garment for upper and lower abdomen?

I had vaser lipo on my upper and lower abdomen 6 days ago. I change rotate my garments 4 times a day and massage as much as I can. I am using foam in my garment to try and help with lumps and some creases but I s find the foam edges often leave indentation in my stomach. I am getting a board today to try but am wondering how long people typically use the foam. I'm trying to make sure my stomach comes out as smooth as possible.