We were in a studio at BLT 3/1 - 3/8 and we put our blue ice in the freezer for the drive home. They froze solid. Didn't have to refreeze them during the two day drive home to Houston (we spent the first night in Ocean Springs, Mississippi). However, with those two blocks of blue ice (2 1/2" X 6" each) in the freezer there wasn't room for much else. Had to remove the toy sized ice cube tray to fit them into the freezer.