It depends on the size of the pieces. My smaller pieces have already reached the sinking point after 2 days soaking in a Home depot bucket. However, my larger pieces, while less buoyant, still aren't ready for hard scaping. Twice a day, I've dumped the water in the bucket and replaced it with fresh boiling water (BE VERY CAREFUL NOT TO BURN YOURSELF WITH THE WATER OR THE LARGE AMOUNT OF STEAM GIVEN OFF BY THE WATER). I'm hoping the large pieces will be sinking by next week
